Bump google-github-actions/auth from 2.1.5 to 2.1.6

Bumps [google-github-actions/auth](https://github.com/google-github-actions/auth) from 2.1.5 to 2.1.6.
- [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@v2.1.5...v2.1.6)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ci-cd.yml

@@ -105,7 +105,7 @@ jobs:
         run: npm ci
 
       - name: Authenticate to Google Cloud
-        uses: google-github-actions/[email protected].5
+        uses: google-github-actions/[email protected].6
         with:
           credentials_json: ${{ secrets.GCP_SA_KEY }}