ci(deps): bump google-github-actions/auth from 1 to 2

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
...

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

.github/workflows/release-slackbot-proxy.yml

@@ -36,7 +36,7 @@ jobs:
         echo ${{ secrets. DOCKER_REGISTRY_PASSWORD }} | docker login --username wsmoogle --password-stdin
 
     - name: Authenticate to Google Cloud for GROWI.cloud
-      uses: google-github-actions/auth@v1
+      uses: google-github-actions/auth@v2
       with:
         credentials_json: '${{ secrets.GCP_SA_KEY_SLACKBOT_PROXY }}'