Bump google-github-actions/auth from 1 to 2 (#78867)

Bumps [google-github-actions/auth](https://github.com/google-github-actions/auth) from 1 to 2.
- [Release notes](https://github.com/google-github-actions/auth/releases)
- [Changelog](https://github.com/google-github-actions/auth/blob/main/CHANGELOG.md)
- [Commits](https://github.com/google-github-actions/auth/compare/v1...v2)

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

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

.github/workflows/core-plugins-build-and-release.yml

@@ -45,7 +45,7 @@ jobs:
             PLUGINS_GRAFANA_API_KEY=core-plugins-build-and-release:PLUGINS_GRAFANA_API_KEY
             PLUGINS_GCOM_TOKEN=core-plugins-build-and-release:PLUGINS_GCOM_TOKEN
       - name: 'Authenticate to Google Cloud'
-        uses: 'google-github-actions/auth@v1'
+        uses: 'google-github-actions/auth@v2'
         with:
           credentials_json: '${{ env.PLUGINS_GOOGLE_CREDENTIALS }}'
       - name: 'Set up Cloud SDK'