Bump google-github-actions/auth from 2.1.7 to 2.1.8 (#260)

Bumps [google-github-actions/auth](https://github.com/google-github-actions/auth) from 2.1.7 to 2.1.8.
- [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@6fc4af4...71f9864)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/main.yaml

@@ -51,7 +51,7 @@ jobs:
       - id: "auth"
         name: "Authenticate to Google Cloud"
         if: github.ref == 'refs/heads/main'
-        uses: "google-github-actions/auth@6fc4af4b145ae7821d527454aa9bd537d1f2dc5f" # ratchet:google-github-actions/auth@v2.1.7
+        uses: "google-github-actions/auth@71f986410dfbc7added4569d411d040a91dc6935" # ratchet:google-github-actions/auth@v2.1.8
         with:
           workload_identity_provider: ${{ secrets.NAIS_IO_WORKLOAD_IDENTITY_PROVIDER }}
           service_account: "gh-aiven-poke@nais-io.iam.gserviceaccount.com"
@@ -114,7 +114,7 @@ jobs:
       - id: 'auth'
         if: github.ref == 'refs/heads/main'
         name: 'Authenticate to Google Cloud'
-        uses: 'google-github-actions/auth@6fc4af4b145ae7821d527454aa9bd537d1f2dc5f' # ratchet:google-github-actions/auth@v2.1.7
+        uses: 'google-github-actions/auth@71f986410dfbc7added4569d411d040a91dc6935' # ratchet:google-github-actions/auth@v2.1.8
         with:
           workload_identity_provider: ${{ secrets.NAIS_IO_WORKLOAD_IDENTITY_PROVIDER }}
           service_account: 'gh-aiven-poke@nais-io.iam.gserviceaccount.com'