build(deps): bump undici and @actions/github

Bumps [undici](https://github.com/nodejs/undici) to 6.28.0 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 6.26.0 to 6.28.0
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](https://github.com/nodejs/undici/compare/v6.26.0...v6.28.0)

Updates `@actions/github` from 7.0.0 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: 6.28.0
  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

@@ -26,7 +26,7 @@
   "license": "MIT",
   "dependencies": {
     "@actions/core": "^2.0.3",
-    "@actions/github": "^7.0.0",
+    "@actions/github": "^9.1.1",
     "@actions/http-client": "^4.0.1",
     "@vercel/ncc": "^0.38.4",
     "node-fetch": "^3.3.2"
@@ -50,10 +50,10 @@
     "uuid": "^11.1.1"
   },
   "overrides": {
-    "undici": "^6.26.0"
+    "undici": "^6.28.0"
   },
   "resolutions": {
-    "undici": "^6.26.0",
+    "undici": "^6.28.0",
     "braces": "^3.0.3",
     "micromatch": "^4.0.8"
   }