Update google-github-actions/auth action to v2.1.6 (#2634)

| datasource  | package                    | from   | to     |
| ----------- | -------------------------- | ------ | ------ |
| github-tags | google-github-actions/auth | v2.1.5 | v2.1.6 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -82,7 +82,7 @@ jobs:
 
       - name: Authenticate to Google Cloud
         id: auth
-        uses: google-github-actions/auth@62cf5bd3e4211a0a0b51f2c6d6a37129d828611d # v2.1.5
+        uses: google-github-actions/auth@8254fb75a33b976a221574d287e93919e6a36f70 # v2.1.6
         with:
           token_format: access_token
           workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY }}

.github/workflows/nfr.yml

@@ -75,7 +75,7 @@ jobs:
 
       - name: Authenticate to Google Cloud
         id: auth
-        uses: google-github-actions/auth@62cf5bd3e4211a0a0b51f2c6d6a37129d828611d # v2.1.5
+        uses: google-github-actions/auth@8254fb75a33b976a221574d287e93919e6a36f70 # v2.1.6
         with:
           token_format: access_token
           workload_identity_provider: ${{ secrets.GCP_WORKLOAD_IDENTITY }}