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": "9.1.0"
+    "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": "^0.4.4",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
-        "execa": "9.1.0"
+        "execa": "8.x"
     },
     "scripts": {
         "agops": "yarn --cwd /usr/src/agoric-sdk/ --silent agops"

proposals/34:upgrade-10/yarn.lock

@@ -763,23 +763,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"execa@npm:9.1.0":
-  version: 9.1.0
-  resolution: "execa@npm:9.1.0"
+"execa@npm:8.x":
+  version: 8.0.1
+  resolution: "execa@npm:8.0.1"
   dependencies:
-    "@sindresorhus/merge-streams": "npm:^4.0.0"
     cross-spawn: "npm:^7.0.3"
-    figures: "npm:^6.1.0"
-    get-stream: "npm:^9.0.0"
-    human-signals: "npm:^7.0.0"
-    is-plain-obj: "npm:^4.1.0"
-    is-stream: "npm:^4.0.1"
-    npm-run-path: "npm:^5.2.0"
-    pretty-ms: "npm:^9.0.0"
+    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:^4.1.0"
-    strip-final-newline: "npm:^4.0.0"
-    yoctocolors: "npm:^2.0.0"
-  checksum: 10c0/9a4810b93d098eb0bed48793b61c3aa3e5804867c2c5808cd2a597a6e71738151a74dc792909085ce1d38e89f4b0e078d93ffd165aaca2d9a6728f3616f8e5c0
+    strip-final-newline: "npm:^3.0.0"
+  checksum: 10c0/2c52d8775f5bf103ce8eec9c7ab3059909ba350a5164744e9947ed14a53f51687c040a250bda833f906d1283aa8803975b84e6c8f7a7c42f99dc8ef80250d1af
   languageName: node
   linkType: hard
 
@@ -952,6 +949,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"get-stream@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "get-stream@npm:8.0.1"
+  checksum: 10c0/5c2181e98202b9dae0bb4a849979291043e5892eb40312b47f0c22b9414fc9b28a3b6063d2375705eb24abc41ecf97894d9a51f64ff021511b504477b27b4290
+  languageName: node
+  linkType: hard
+
 "get-stream@npm:^9.0.0":
   version: 9.0.1
   resolution: "get-stream@npm:9.0.1"
@@ -1040,10 +1044,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"human-signals@npm:^7.0.0":
-  version: 7.0.0
-  resolution: "human-signals@npm:7.0.0"
-  checksum: 10c0/ce0c6d62d2e9bfe529d48f7c7fdf4b8c70fce950eef7850719b4e3f5bc71795ae7d61a3699ce13262bed7847705822601cc81f1921ea6a2906852e16228a94ab
+"human-signals@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "human-signals@npm:5.0.0"
+  checksum: 10c0/5a9359073fe17a8b58e5a085e9a39a950366d9f00217c4ff5878bd312e09d80f460536ea6a3f260b5943a01fe55c158d1cea3fc7bee3d0520aeef04f6d915c82
   languageName: node
   linkType: hard
 
@@ -1214,6 +1218,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"is-stream@npm:^3.0.0":
+  version: 3.0.0
+  resolution: "is-stream@npm:3.0.0"
+  checksum: 10c0/eb2f7127af02ee9aa2a0237b730e47ac2de0d4e76a4a905a50a11557f2339df5765eaea4ceb8029f1efa978586abe776908720bfcb1900c20c6ec5145f6f29d8
+  languageName: node
+  linkType: hard
+
 "is-stream@npm:^4.0.1":
   version: 4.0.1
   resolution: "is-stream@npm:4.0.1"
@@ -1376,6 +1387,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"merge-stream@npm:^2.0.0":
+  version: 2.0.0
+  resolution: "merge-stream@npm:2.0.0"
+  checksum: 10c0/867fdbb30a6d58b011449b8885601ec1690c3e41c759ecd5a9d609094f7aed0096c37823ff4a7190ef0b8f22cc86beb7049196ff68c016e3b3c671d0dac91ce5
+  languageName: node
+  linkType: hard
+
 "merge2@npm:^1.3.0, merge2@npm:^1.4.1":
   version: 1.4.1
   resolution: "merge2@npm:1.4.1"
@@ -1605,7 +1623,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"npm-run-path@npm:^5.2.0":
+"npm-run-path@npm:^5.1.0":
   version: 5.3.0
   resolution: "npm-run-path@npm:5.3.0"
   dependencies:
@@ -1633,6 +1651,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"onetime@npm:^6.0.0":
+  version: 6.0.0
+  resolution: "onetime@npm:6.0.0"
+  dependencies:
+    mimic-fn: "npm:^4.0.0"
+  checksum: 10c0/4eef7c6abfef697dd4479345a4100c382d73c149d2d56170a54a07418c50816937ad09500e1ed1e79d235989d073a9bade8557122aee24f0576ecde0f392bb6c
+  languageName: node
+  linkType: hard
+
 "p-defer@npm:^1.0.0":
   version: 1.0.0
   resolution: "p-defer@npm:1.0.0"
@@ -1922,7 +1949,7 @@ __metadata:
     "@agoric/synthetic-chain": "npm:^0.4.4"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
-    execa: "npm:9.1.0"
+    execa: "npm:8.x"
   languageName: unknown
   linkType: soft
 
@@ -2129,6 +2156,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"strip-final-newline@npm:^3.0.0":
+  version: 3.0.0
+  resolution: "strip-final-newline@npm:3.0.0"
+  checksum: 10c0/a771a17901427bac6293fd416db7577e2bc1c34a19d38351e9d5478c3c415f523f391003b42ed475f27e33a78233035df183525395f731d3bfb8cdcbd4da08ce
+  languageName: node
+  linkType: hard
+
 "strip-final-newline@npm:^4.0.0":
   version: 4.0.0
   resolution: "strip-final-newline@npm:4.0.0"

proposals/43:upgrade-11/package.json

@@ -11,7 +11,7 @@
         "@agoric/synthetic-chain": "^0.4.4",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
-        "execa": "9.1.0"
+        "execa": "8.x"
     },
     "scripts": {
         "agops": "yarn --cwd /usr/src/agoric-sdk/ --silent agops"

proposals/43:upgrade-11/yarn.lock

@@ -763,23 +763,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"execa@npm:9.1.0":
-  version: 9.1.0
-  resolution: "execa@npm:9.1.0"
+"execa@npm:8.x":
+  version: 8.0.1
+  resolution: "execa@npm:8.0.1"
   dependencies:
-    "@sindresorhus/merge-streams": "npm:^4.0.0"
     cross-spawn: "npm:^7.0.3"
-    figures: "npm:^6.1.0"
-    get-stream: "npm:^9.0.0"
-    human-signals: "npm:^7.0.0"
-    is-plain-obj: "npm:^4.1.0"
-    is-stream: "npm:^4.0.1"
-    npm-run-path: "npm:^5.2.0"
-    pretty-ms: "npm:^9.0.0"
+    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:^4.1.0"
-    strip-final-newline: "npm:^4.0.0"
-    yoctocolors: "npm:^2.0.0"
-  checksum: 10c0/9a4810b93d098eb0bed48793b61c3aa3e5804867c2c5808cd2a597a6e71738151a74dc792909085ce1d38e89f4b0e078d93ffd165aaca2d9a6728f3616f8e5c0
+    strip-final-newline: "npm:^3.0.0"
+  checksum: 10c0/2c52d8775f5bf103ce8eec9c7ab3059909ba350a5164744e9947ed14a53f51687c040a250bda833f906d1283aa8803975b84e6c8f7a7c42f99dc8ef80250d1af
   languageName: node
   linkType: hard
 
@@ -952,6 +949,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"get-stream@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "get-stream@npm:8.0.1"
+  checksum: 10c0/5c2181e98202b9dae0bb4a849979291043e5892eb40312b47f0c22b9414fc9b28a3b6063d2375705eb24abc41ecf97894d9a51f64ff021511b504477b27b4290
+  languageName: node
+  linkType: hard
+
 "get-stream@npm:^9.0.0":
   version: 9.0.1
   resolution: "get-stream@npm:9.0.1"
@@ -1040,10 +1044,10 @@ __metadata:
   languageName: node
   linkType: hard
 
-"human-signals@npm:^7.0.0":
-  version: 7.0.0
-  resolution: "human-signals@npm:7.0.0"
-  checksum: 10c0/ce0c6d62d2e9bfe529d48f7c7fdf4b8c70fce950eef7850719b4e3f5bc71795ae7d61a3699ce13262bed7847705822601cc81f1921ea6a2906852e16228a94ab
+"human-signals@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "human-signals@npm:5.0.0"
+  checksum: 10c0/5a9359073fe17a8b58e5a085e9a39a950366d9f00217c4ff5878bd312e09d80f460536ea6a3f260b5943a01fe55c158d1cea3fc7bee3d0520aeef04f6d915c82
   languageName: node
   linkType: hard
 
@@ -1214,6 +1218,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"is-stream@npm:^3.0.0":
+  version: 3.0.0
+  resolution: "is-stream@npm:3.0.0"
+  checksum: 10c0/eb2f7127af02ee9aa2a0237b730e47ac2de0d4e76a4a905a50a11557f2339df5765eaea4ceb8029f1efa978586abe776908720bfcb1900c20c6ec5145f6f29d8
+  languageName: node
+  linkType: hard
+
 "is-stream@npm:^4.0.1":
   version: 4.0.1
   resolution: "is-stream@npm:4.0.1"
@@ -1376,6 +1387,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"merge-stream@npm:^2.0.0":
+  version: 2.0.0
+  resolution: "merge-stream@npm:2.0.0"
+  checksum: 10c0/867fdbb30a6d58b011449b8885601ec1690c3e41c759ecd5a9d609094f7aed0096c37823ff4a7190ef0b8f22cc86beb7049196ff68c016e3b3c671d0dac91ce5
+  languageName: node
+  linkType: hard
+
 "merge2@npm:^1.3.0, merge2@npm:^1.4.1":
   version: 1.4.1
   resolution: "merge2@npm:1.4.1"
@@ -1605,7 +1623,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"npm-run-path@npm:^5.2.0":
+"npm-run-path@npm:^5.1.0":
   version: 5.3.0
   resolution: "npm-run-path@npm:5.3.0"
   dependencies:
@@ -1633,6 +1651,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"onetime@npm:^6.0.0":
+  version: 6.0.0
+  resolution: "onetime@npm:6.0.0"
+  dependencies:
+    mimic-fn: "npm:^4.0.0"
+  checksum: 10c0/4eef7c6abfef697dd4479345a4100c382d73c149d2d56170a54a07418c50816937ad09500e1ed1e79d235989d073a9bade8557122aee24f0576ecde0f392bb6c
+  languageName: node
+  linkType: hard
+
 "p-defer@npm:^1.0.0":
   version: 1.0.0
   resolution: "p-defer@npm:1.0.0"
@@ -1922,7 +1949,7 @@ __metadata:
     "@agoric/synthetic-chain": "npm:^0.4.4"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
-    execa: "npm:9.1.0"
+    execa: "npm:8.x"
   languageName: unknown
   linkType: soft
 
@@ -2129,6 +2156,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"strip-final-newline@npm:^3.0.0":
+  version: 3.0.0
+  resolution: "strip-final-newline@npm:3.0.0"
+  checksum: 10c0/a771a17901427bac6293fd416db7577e2bc1c34a19d38351e9d5478c3c415f523f391003b42ed475f27e33a78233035df183525395f731d3bfb8cdcbd4da08ce
+  languageName: node
+  linkType: hard
+
 "strip-final-newline@npm:^4.0.0":
   version: 4.0.0
   resolution: "strip-final-newline@npm:4.0.0"

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": "9.1.0",
+        "execa": "8.x",
         "tmp": "^0.2.1"
     },
     "scripts": {