Bump undici, @actions/http-client and @actions/github

Bumps [undici](https://github.com/nodejs/undici) to 6.23.0 and updates ancestor dependencies [undici](https://github.com/nodejs/undici), [@actions/http-client](https://github.com/actions/toolkit/tree/HEAD/packages/http-client) and [@actions/github](https://github.com/actions/toolkit/tree/HEAD/packages/github). These dependencies need to be updated together.


Updates `undici` from 5.29.0 to 6.23.0
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](https://github.com/nodejs/undici/compare/v5.29.0...v6.23.0)

Updates `@actions/http-client` from 2.2.3 to 4.0.0
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/http-client/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/@actions/cache@4.0.0/packages/http-client)

Updates `@actions/github` from 6.0.1 to 9.0.0
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/github/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/github)

---
updated-dependencies:
- dependency-name: undici
  dependency-version: 6.23.0
  dependency-type: indirect
- dependency-name: "@actions/http-client"
  dependency-version: 4.0.0
  dependency-type: direct:production
- dependency-name: "@actions/github"
  dependency-version: 9.0.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -31,9 +31,9 @@
     "@actions/cache": "^5.0.1",
     "@actions/core": "^1.11.1",
     "@actions/exec": "^1.1.1",
-    "@actions/github": "^6.0.1",
+    "@actions/github": "^9.0.0",
     "@actions/glob": "^0.5.0",
-    "@actions/http-client": "^2.2.1",
+    "@actions/http-client": "^4.0.0",
     "@actions/io": "^1.0.2",
     "@actions/tool-cache": "^2.0.2",
     "semver": "^7.6.3",