chore: Downgrade execa to 8.x to resolve a CI failure

```
file:///usr/src/proposals/34:upgrade-10/node_modules/@agoric/synthetic-chain/node_modules/execa/lib/utils/max-listeners.js:1
import {addAbortListener} from 'node:events';
        ^^^^^^^^^^^^^^^^
SyntaxError: The requested module 'node:events' does not provide an export named 'addAbortListener'
```

packages/synthetic-chain/package.json

@@ -24,7 +24,7 @@
     "better-sqlite3": "^9.6.0",
     "chalk": "^5.3.0",
     "cosmjs-types": "^0.9.0",
-    "execa": "^9.3.1"
+    "execa": "8.x"
   },
   "devDependencies": {
     "@agoric/cosmic-proto": "^0.4.1-dev-c5284e4.0",

proposals/34:upgrade-10/package.json

@@ -11,7 +11,7 @@
         "@agoric/synthetic-chain": "^0.0.1-rc0",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
-        "execa": "^7.2.0"
+        "execa": "8.x"
     },
     "scripts": {
         "agops": "yarn --cwd /usr/src/agoric-sdk/ --silent agops"

proposals/34:upgrade-10/yarn.lock

@@ -959,20 +959,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"execa@npm:^7.2.0":
-  version: 7.2.0
-  resolution: "execa@npm:7.2.0"
+"execa@npm:8.x":
+  version: 8.0.1
+  resolution: "execa@npm:8.0.1"
   dependencies:
     cross-spawn: "npm:^7.0.3"
-    get-stream: "npm:^6.0.1"
-    human-signals: "npm:^4.3.0"
+    get-stream: "npm:^8.0.1"
+    human-signals: "npm:^5.0.0"
     is-stream: "npm:^3.0.0"
     merge-stream: "npm:^2.0.0"
     npm-run-path: "npm:^5.1.0"
     onetime: "npm:^6.0.0"
-    signal-exit: "npm:^3.0.7"
+    signal-exit: "npm:^4.1.0"
     strip-final-newline: "npm:^3.0.0"
-  checksum: 10c0/098cd6a1bc26d509e5402c43f4971736450b84d058391820c6f237aeec6436963e006fd8423c9722f148c53da86aa50045929c7278b5522197dff802d10f9885
+  checksum: 10c0/2c52d8775f5bf103ce8eec9c7ab3059909ba350a5164744e9947ed14a53f51687c040a250bda833f906d1283aa8803975b84e6c8f7a7c42f99dc8ef80250d1af
   languageName: node
   linkType: hard
 
@@ -1116,10 +1116,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"get-stream@npm:^6.0.1":
-  version: 6.0.1
-  resolution: "get-stream@npm:6.0.1"
-  checksum: 10c0/49825d57d3fd6964228e6200a58169464b8e8970489b3acdc24906c782fb7f01f9f56f8e6653c4a50713771d6658f7cfe051e5eb8c12e334138c9c918b296341
+"get-stream@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "get-stream@npm:8.0.1"
+  checksum: 10c0/5c2181e98202b9dae0bb4a849979291043e5892eb40312b47f0c22b9414fc9b28a3b6063d2375705eb24abc41ecf97894d9a51f64ff021511b504477b27b4290
   languageName: node
   linkType: hard
 
@@ -1210,10 +1210,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"human-signals@npm:^4.3.0":
-  version: 4.3.1
-  resolution: "human-signals@npm:4.3.1"
-  checksum: 10c0/40498b33fe139f5cc4ef5d2f95eb1803d6318ac1b1c63eaf14eeed5484d26332c828de4a5a05676b6c83d7b9e57727c59addb4b1dea19cb8d71e83689e5b336c
+"human-signals@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "human-signals@npm:5.0.0"
+  checksum: 10c0/5a9359073fe17a8b58e5a085e9a39a950366d9f00217c4ff5878bd312e09d80f460536ea6a3f260b5943a01fe55c158d1cea3fc7bee3d0520aeef04f6d915c82
   languageName: node
   linkType: hard
 
@@ -2068,7 +2068,7 @@ __metadata:
     "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
-    execa: "npm:^7.2.0"
+    execa: "npm:8.x"
   languageName: unknown
   linkType: soft
 
@@ -2131,14 +2131,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"signal-exit@npm:^3.0.7":
-  version: 3.0.7
-  resolution: "signal-exit@npm:3.0.7"
-  checksum: 10c0/25d272fa73e146048565e08f3309d5b942c1979a6f4a58a8c59d5fa299728e9c2fcd1a759ec870863b1fd38653670240cd420dad2ad9330c71f36608a6a1c912
-  languageName: node
-  linkType: hard
-
-"signal-exit@npm:^4.0.1":
+"signal-exit@npm:^4.0.1, signal-exit@npm:^4.1.0":
   version: 4.1.0
   resolution: "signal-exit@npm:4.1.0"
   checksum: 10c0/41602dce540e46d599edba9d9860193398d135f7ff72cab629db5171516cfae628d21e7bfccde1bbfdf11c48726bc2a6d1a8fb8701125852fbfda7cf19c6aa83

proposals/43:upgrade-11/package.json

@@ -11,7 +11,7 @@
         "@agoric/synthetic-chain": "^0.0.1-rc0",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
-        "execa": "^7.2.0"
+        "execa": "8.x"
     },
     "scripts": {
         "agops": "yarn --cwd /usr/src/agoric-sdk/ --silent agops"

proposals/43:upgrade-11/yarn.lock

@@ -959,20 +959,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"execa@npm:^7.2.0":
-  version: 7.2.0
-  resolution: "execa@npm:7.2.0"
+"execa@npm:8.x":
+  version: 8.0.1
+  resolution: "execa@npm:8.0.1"
   dependencies:
     cross-spawn: "npm:^7.0.3"
-    get-stream: "npm:^6.0.1"
-    human-signals: "npm:^4.3.0"
+    get-stream: "npm:^8.0.1"
+    human-signals: "npm:^5.0.0"
     is-stream: "npm:^3.0.0"
     merge-stream: "npm:^2.0.0"
     npm-run-path: "npm:^5.1.0"
     onetime: "npm:^6.0.0"
-    signal-exit: "npm:^3.0.7"
+    signal-exit: "npm:^4.1.0"
     strip-final-newline: "npm:^3.0.0"
-  checksum: 10c0/098cd6a1bc26d509e5402c43f4971736450b84d058391820c6f237aeec6436963e006fd8423c9722f148c53da86aa50045929c7278b5522197dff802d10f9885
+  checksum: 10c0/2c52d8775f5bf103ce8eec9c7ab3059909ba350a5164744e9947ed14a53f51687c040a250bda833f906d1283aa8803975b84e6c8f7a7c42f99dc8ef80250d1af
   languageName: node
   linkType: hard
 
@@ -1116,10 +1116,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"get-stream@npm:^6.0.1":
-  version: 6.0.1
-  resolution: "get-stream@npm:6.0.1"
-  checksum: 10c0/49825d57d3fd6964228e6200a58169464b8e8970489b3acdc24906c782fb7f01f9f56f8e6653c4a50713771d6658f7cfe051e5eb8c12e334138c9c918b296341
+"get-stream@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "get-stream@npm:8.0.1"
+  checksum: 10c0/5c2181e98202b9dae0bb4a849979291043e5892eb40312b47f0c22b9414fc9b28a3b6063d2375705eb24abc41ecf97894d9a51f64ff021511b504477b27b4290
   languageName: node
   linkType: hard
 
@@ -1210,10 +1210,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"human-signals@npm:^4.3.0":
-  version: 4.3.1
-  resolution: "human-signals@npm:4.3.1"
-  checksum: 10c0/40498b33fe139f5cc4ef5d2f95eb1803d6318ac1b1c63eaf14eeed5484d26332c828de4a5a05676b6c83d7b9e57727c59addb4b1dea19cb8d71e83689e5b336c
+"human-signals@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "human-signals@npm:5.0.0"
+  checksum: 10c0/5a9359073fe17a8b58e5a085e9a39a950366d9f00217c4ff5878bd312e09d80f460536ea6a3f260b5943a01fe55c158d1cea3fc7bee3d0520aeef04f6d915c82
   languageName: node
   linkType: hard
 
@@ -2068,7 +2068,7 @@ __metadata:
     "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
-    execa: "npm:^7.2.0"
+    execa: "npm:8.x"
   languageName: unknown
   linkType: soft
 
@@ -2131,14 +2131,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"signal-exit@npm:^3.0.7":
-  version: 3.0.7
-  resolution: "signal-exit@npm:3.0.7"
-  checksum: 10c0/25d272fa73e146048565e08f3309d5b942c1979a6f4a58a8c59d5fa299728e9c2fcd1a759ec870863b1fd38653670240cd420dad2ad9330c71f36608a6a1c912
-  languageName: node
-  linkType: hard
-
-"signal-exit@npm:^4.0.1":
+"signal-exit@npm:^4.0.1, signal-exit@npm:^4.1.0":
   version: 4.1.0
   resolution: "signal-exit@npm:4.1.0"
   checksum: 10c0/41602dce540e46d599edba9d9860193398d135f7ff72cab629db5171516cfae628d21e7bfccde1bbfdf11c48726bc2a6d1a8fb8701125852fbfda7cf19c6aa83

proposals/49:smart-wallet-nft/package.json

@@ -9,7 +9,7 @@
         "@endo/zip": "^0.2.35",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
-        "execa": "^7.2.0",
+        "execa": "8.x",
         "tmp": "^0.2.1"
     },
     "scripts": {

proposals/49:smart-wallet-nft/yarn.lock

@@ -983,20 +983,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"execa@npm:^7.2.0":
-  version: 7.2.0
-  resolution: "execa@npm:7.2.0"
+"execa@npm:8.x":
+  version: 8.0.1
+  resolution: "execa@npm:8.0.1"
   dependencies:
     cross-spawn: "npm:^7.0.3"
-    get-stream: "npm:^6.0.1"
-    human-signals: "npm:^4.3.0"
+    get-stream: "npm:^8.0.1"
+    human-signals: "npm:^5.0.0"
     is-stream: "npm:^3.0.0"
     merge-stream: "npm:^2.0.0"
     npm-run-path: "npm:^5.1.0"
     onetime: "npm:^6.0.0"
-    signal-exit: "npm:^3.0.7"
+    signal-exit: "npm:^4.1.0"
     strip-final-newline: "npm:^3.0.0"
-  checksum: 10c0/098cd6a1bc26d509e5402c43f4971736450b84d058391820c6f237aeec6436963e006fd8423c9722f148c53da86aa50045929c7278b5522197dff802d10f9885
+  checksum: 10c0/2c52d8775f5bf103ce8eec9c7ab3059909ba350a5164744e9947ed14a53f51687c040a250bda833f906d1283aa8803975b84e6c8f7a7c42f99dc8ef80250d1af
   languageName: node
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@@ -1147,10 +1147,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"get-stream@npm:^6.0.1":
-  version: 6.0.1
-  resolution: "get-stream@npm:6.0.1"
-  checksum: 10c0/49825d57d3fd6964228e6200a58169464b8e8970489b3acdc24906c782fb7f01f9f56f8e6653c4a50713771d6658f7cfe051e5eb8c12e334138c9c918b296341
+"get-stream@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "get-stream@npm:8.0.1"
+  checksum: 10c0/5c2181e98202b9dae0bb4a849979291043e5892eb40312b47f0c22b9414fc9b28a3b6063d2375705eb24abc41ecf97894d9a51f64ff021511b504477b27b4290
   languageName: node
   linkType: hard
 
@@ -1255,10 +1255,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"human-signals@npm:^4.3.0":
-  version: 4.3.1
-  resolution: "human-signals@npm:4.3.1"
-  checksum: 10c0/40498b33fe139f5cc4ef5d2f95eb1803d6318ac1b1c63eaf14eeed5484d26332c828de4a5a05676b6c83d7b9e57727c59addb4b1dea19cb8d71e83689e5b336c
+"human-signals@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "human-signals@npm:5.0.0"
+  checksum: 10c0/5a9359073fe17a8b58e5a085e9a39a950366d9f00217c4ff5878bd312e09d80f460536ea6a3f260b5943a01fe55c158d1cea3fc7bee3d0520aeef04f6d915c82
   languageName: node
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@@ -2151,7 +2151,7 @@ __metadata:
     "@endo/zip": "npm:^0.2.35"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
-    execa: "npm:^7.2.0"
+    execa: "npm:8.x"
     tmp: "npm:^0.2.1"
   languageName: unknown
   linkType: soft
@@ -2215,14 +2215,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"signal-exit@npm:^3.0.7":
-  version: 3.0.7
-  resolution: "signal-exit@npm:3.0.7"
-  checksum: 10c0/25d272fa73e146048565e08f3309d5b942c1979a6f4a58a8c59d5fa299728e9c2fcd1a759ec870863b1fd38653670240cd420dad2ad9330c71f36608a6a1c912
-  languageName: node
-  linkType: hard
-
-"signal-exit@npm:^4.0.1":
+"signal-exit@npm:^4.0.1, signal-exit@npm:^4.1.0":
   version: 4.1.0
   resolution: "signal-exit@npm:4.1.0"
   checksum: 10c0/41602dce540e46d599edba9d9860193398d135f7ff72cab629db5171516cfae628d21e7bfccde1bbfdf11c48726bc2a6d1a8fb8701125852fbfda7cf19c6aa83

proposals/53:kread-start/package.json

@@ -9,7 +9,7 @@
     "@endo/zip": "^0.2.35",
     "ava": "^5.3.1",
     "better-sqlite3": "^8.5.1",
-    "execa": "^7.2.0",
+    "execa": "8.x",
     "tmp": "^0.2.1"
   },
   "scripts": {

proposals/53:kread-start/yarn.lock

@@ -983,20 +983,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"execa@npm:^7.2.0":
-  version: 7.2.0
-  resolution: "execa@npm:7.2.0"
+"execa@npm:8.x":
+  version: 8.0.1
+  resolution: "execa@npm:8.0.1"
   dependencies:
     cross-spawn: "npm:^7.0.3"
-    get-stream: "npm:^6.0.1"
-    human-signals: "npm:^4.3.0"
+    get-stream: "npm:^8.0.1"
+    human-signals: "npm:^5.0.0"
     is-stream: "npm:^3.0.0"
     merge-stream: "npm:^2.0.0"
     npm-run-path: "npm:^5.1.0"
     onetime: "npm:^6.0.0"
-    signal-exit: "npm:^3.0.7"
+    signal-exit: "npm:^4.1.0"
     strip-final-newline: "npm:^3.0.0"
-  checksum: 10c0/098cd6a1bc26d509e5402c43f4971736450b84d058391820c6f237aeec6436963e006fd8423c9722f148c53da86aa50045929c7278b5522197dff802d10f9885
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@@ -1147,10 +1147,10 @@ __metadata:
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-"get-stream@npm:^6.0.1":
-  version: 6.0.1
-  resolution: "get-stream@npm:6.0.1"
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+"get-stream@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "get-stream@npm:8.0.1"
+  checksum: 10c0/5c2181e98202b9dae0bb4a849979291043e5892eb40312b47f0c22b9414fc9b28a3b6063d2375705eb24abc41ecf97894d9a51f64ff021511b504477b27b4290
   languageName: node
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@@ -1255,10 +1255,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"human-signals@npm:^4.3.0":
-  version: 4.3.1
-  resolution: "human-signals@npm:4.3.1"
-  checksum: 10c0/40498b33fe139f5cc4ef5d2f95eb1803d6318ac1b1c63eaf14eeed5484d26332c828de4a5a05676b6c83d7b9e57727c59addb4b1dea19cb8d71e83689e5b336c
+"human-signals@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "human-signals@npm:5.0.0"
+  checksum: 10c0/5a9359073fe17a8b58e5a085e9a39a950366d9f00217c4ff5878bd312e09d80f460536ea6a3f260b5943a01fe55c158d1cea3fc7bee3d0520aeef04f6d915c82
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@@ -2151,7 +2151,7 @@ __metadata:
     "@endo/zip": "npm:^0.2.35"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
-    execa: "npm:^7.2.0"
+    execa: "npm:8.x"
     tmp: "npm:^0.2.1"
   languageName: unknown
   linkType: soft
@@ -2215,14 +2215,7 @@ __metadata:
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-"signal-exit@npm:^3.0.7":
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-  resolution: "signal-exit@npm:3.0.7"
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-"signal-exit@npm:^4.0.1":
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proposals/55:statom-vaults/package.json

@@ -9,7 +9,7 @@
         "@endo/zip": "^0.2.35",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
-        "execa": "^7.2.0",
+        "execa": "8.x",
         "tmp": "^0.2.1"
     },
     "scripts": {