Bump google-github-actions/auth from 2.1.4 to 2.1.5

Bumps [google-github-actions/auth](https://github.com/google-github-actions/auth) from 2.1.4 to 2.1.5.
- [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@f112390...62cf5bd)

---
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]>

Author: dependabot[bot]

.github/workflows/conformance-tetragon-gke.yaml

@@ -40,7 +40,7 @@ jobs:
 
       - name: Set up gcloud credentials
         id: 'auth'
-        uses: 'google-github-actions/auth@f112390a2df9932162083945e46d439060d66ec2'
+        uses: 'google-github-actions/auth@62cf5bd3e4211a0a0b51f2c6d6a37129d828611d'
         with:
           credentials_json: '${{ secrets.GCP_PR_SA_KEY }}'