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@62cf5bd...8254fb7)

---
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/main.yml

@@ -57,7 +57,7 @@ jobs:
       - id: 'auth'
         name: 'Authenticate to Google Cloud'
         if: github.ref == 'refs/heads/main'
-        uses: 'google-github-actions/auth@62cf5bd3e4211a0a0b51f2c6d6a37129d828611d' # ratchet:google-github-actions/[email protected].5
+        uses: 'google-github-actions/auth@8254fb75a33b976a221574d287e93919e6a36f70' # ratchet:google-github-actions/[email protected].6
         with:
           workload_identity_provider: ${{ secrets.NAIS_IO_WORKLOAD_IDENTITY_PROVIDER }}
           service_account: '[email protected]'