Bump google-auth-library from 8.7.0 to 9.0.0 in /scripts/gcb2slack (#…

…3069)

Bumps [google-auth-library](https://github.com/googleapis/google-auth-library-nodejs) from 8.7.0 to 9.0.0.
- [Release notes](https://github.com/googleapis/google-auth-library-nodejs/releases)
- [Changelog](https://github.com/googleapis/google-auth-library-nodejs/blob/main/CHANGELOG.md)
- [Commits](googleapis/google-auth-library-nodejs@v8.7.0...v9.0.0)

---
updated-dependencies:
- dependency-name: google-auth-library
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

scripts/gcb2slack/package.json

@@ -6,6 +6,6 @@
   "dependencies": {
     "@google-cloud/functions-framework": "^1.3.2",
     "@slack/webhook": "^5.0.4",
-    "google-auth-library": "^8.7.0"
+    "google-auth-library": "^9.0.0"
   }
 }