Bump execa from 6.1.0 to 9.4.0

Bumps [execa](https://github.com/sindresorhus/execa) from 6.1.0 to 9.4.0.
- [Release notes](https://github.com/sindresorhus/execa/releases)
- [Commits](sindresorhus/execa@v6.1.0...v9.4.0)

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

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

package.json

@@ -39,7 +39,7 @@
     "@types/react-dom": "^18.2.0",
     "common-tags": "^1.8.2",
     "esbuild": "^0.23.0",
-    "execa": "^6.1.0",
+    "execa": "^9.4.0",
     "jsdom": "^24.0.0",
     "preact": "^10.21.0",
     "prettier": "^3.2.0",