Merge pull request #1125 from spiffxp/use-k8s-infra-for-gcb-image

images: use k8s-staging-test-infra/gcb-docker-gcloud

cloudbuild.yaml

 timeout: 3600s
 steps:
-  - name: gcr.io/k8s-testimages/gcb-docker-gcloud:v20210722-085d930
+  - name: gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20211008-60e346af
     entrypoint: ./hack/prow.sh
     env:
       - GIT_TAG=${_GIT_TAG}