Bump google-github-actions/auth in the action-dependencies group

Bumps the action-dependencies group with 1 update: [google-github-actions/auth](https://github.com/google-github-actions/auth).


Updates `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
  dependency-group: action-dependencies
...

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

.github/workflows/test-kms.yml

@@ -32,7 +32,7 @@ jobs:
           pip install --upgrade tox
 
       - name: Authenticate to Google Cloud
-        uses: google-github-actions/auth@f112390a2df9932162083945e46d439060d66ec2
+        uses: google-github-actions/auth@62cf5bd3e4211a0a0b51f2c6d6a37129d828611d
         with:
           token_format: access_token
           workload_identity_provider: projects/843741030650/locations/global/workloadIdentityPools/securesystemslib-tests/providers/securesystemslib-tests