chore: bump undici from 6.21.0 to 7.0.0

Bumps [undici](https://github.com/nodejs/undici) from 6.21.0 to 7.0.0.
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.21.0...v7.0.0)

---
updated-dependencies:
- dependency-name: undici
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

packages/fetch-impl/package.json

@@ -7,7 +7,7 @@
     },
     "devDependencies": {
         "tinybench": "^3.0.6",
-        "undici": "^6.21.0"
+        "undici": "^7.0.0"
     },
     "engines": {
         "node": ">=20.18.0"

packages/rpc-transport-http/package.json

@@ -79,7 +79,7 @@
     },
     "devDependencies": {
         "tinybench": "^3.0.6",
-        "undici": "^6.21.0",
+        "undici": "^7.0.0",
         "zx": "^8.2.2"
     },
     "peerDependencies": {

packages/test-config/package.json

@@ -8,12 +8,12 @@
     ],
     "peerDependencies": {
         "jest-dev-server": "^10.0.0",
-        "undici": "^6.21.0",
+        "undici": "^7.0.0",
         "whatwg-fetch": "^3.6.20"
     },
     "devDependencies": {
         "@jest/types": "^29.6.3",
-        "undici": "^6.21.0",
+        "undici": "^7.0.0",
         "whatwg-fetch": "^3.6.20"
     },
     "engines": {