Bump undici and @actions/github

Bumps [undici](https://github.com/nodejs/undici) to 6.27.0 and updates ancestor dependency [@actions/github](https://github.com/actions/toolkit/tree/HEAD/packages/github). These dependencies need to be updated together.


Updates `undici` from 6.24.1 to 6.27.0
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](https://github.com/nodejs/undici/compare/v6.24.1...v6.27.0)

Updates `@actions/github` from 6.0.1 to 9.1.1
- [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: 6.27.0
  dependency-type: indirect
- dependency-name: "@actions/github"
  dependency-version: 9.1.1
  dependency-type: direct:production
...

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

package.json

@@ -31,7 +31,7 @@
     "@actions/cache": "^5.0.5",
     "@actions/core": "^2.0.3",
     "@actions/exec": "^2.0.0",
-    "@actions/github": "^6.0.1",
+    "@actions/github": "^9.1.1",
     "@actions/glob": "^0.5.1",
     "@actions/http-client": "^3.0.2",
     "@actions/io": "^2.0.0",