[ci] Bump google-github-actions/auth from 2 to 3

Bumps [google-github-actions/auth](https://github.com/google-github-actions/auth) from 2 to 3.
- [Release notes](https://github.com/google-github-actions/auth/releases)
- [Changelog](https://github.com/google-github-actions/auth/blob/main/CHANGELOG.md)
- [Commits](google-github-actions/auth@v2...v3)

---
updated-dependencies:
- dependency-name: google-github-actions/auth
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -88,7 +88,7 @@ jobs:
 
       - name: Google Cloud Auth
         if: ${{ github.event_name=='push' }}
-        uses: 'google-github-actions/auth@v2'
+        uses: 'google-github-actions/auth@v3'
         with:
           project_id: ${{ secrets.GCS_PROJECT_ID }}
           credentials_json: ${{ secrets.GCS_DOWNLOADS_SERVICE_ACCOUNT_JSON }}