chore(deps): Update google-github-actions/auth action to v3

Author: renovate-bot

.github/workflows/tests.yml

@@ -56,7 +56,7 @@ jobs:
 
       - id: auth
         name: Authenticate to Google Cloud
-        uses: google-github-actions/auth@b7593ed2efd1c1617e1b0254da33b86225adb2a5 # v2.1.12
+        uses: google-github-actions/auth@7c6bc770dae815cd3e89ee6cdf493a5fab2cc093 # v3.0.0
         with:
           workload_identity_provider: ${{ vars.PROVIDER_NAME }}
           service_account: ${{ vars.SERVICE_ACCOUNT }}
@@ -167,7 +167,7 @@ jobs:
         name: Authenticate to Google Cloud
         # only needed for Flakybot on periodic (schedule) and continuous (push) events
         if: ${{ github.event_name == 'schedule' || github.event_name == 'push' }}
-        uses: google-github-actions/auth@b7593ed2efd1c1617e1b0254da33b86225adb2a5 # v2.1.12
+        uses: google-github-actions/auth@7c6bc770dae815cd3e89ee6cdf493a5fab2cc093 # v3.0.0
         with:
           workload_identity_provider: ${{ vars.PROVIDER_NAME }}
           service_account: ${{ vars.SERVICE_ACCOUNT }}