build(deps): bump google-github-actions/auth from 1.1.0 to 2.1.0

Bumps [google-github-actions/auth](https://github.com/google-github-actions/auth) from 1.1.0 to 2.1.0.
- [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@e8df18b...5a50e58)

---
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/keyless-salsa-integration.yaml

@@ -21,7 +21,7 @@ jobs:
       - name: Checkout Code
         uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # ratchet:actions/checkout@v3
       - name: Authenticate to Google Cloud
-        uses: google-github-actions/auth@e8df18b60c5dd38ba618c121b779307266153fbf # ratchet:google-github-actions/auth@v1.1.0
+        uses: google-github-actions/auth@5a50e581162a13f4baa8916d01180d2acbc04363 # ratchet:google-github-actions/auth@v2.1.0
         id: google
         with:
           workload_identity_provider: ${{ secrets.SLSA_WORKLOAD_IDENTITY_PROVIDER }}

.github/workflows/service-account-salsa-integration.yml

@@ -23,7 +23,7 @@ jobs:
       # Credentials needed to authenticate to google kms and sign image.
       - name: Authenticate to Google Cloud
         id: google
-        uses: google-github-actions/auth@e8df18b60c5dd38ba618c121b779307266153fbf # ratchet:google-github-actions/auth@v0
+        uses: google-github-actions/auth@5a50e581162a13f4baa8916d01180d2acbc04363 # ratchet:google-github-actions/auth@v0
         with:
           credentials_json: ${{ secrets.SALSA_CREDENTIALS }}
       # For demonstration purpose