use k8s-staging-test-infra/gcb-docker-gcloud (#392)

Related:
  - Part of: kubernetes/k8s.io#1523
  - Followup of: kubernetes/test-infra#23656

Use a version of gcb-docker-gcloud that is hosted in a community-owned
repo instead of a google.com-owned repo.

Signed-off-by: Arnaud Meukam <[email protected]>

Author: ameukam

cloudbuild.yaml

@@ -3,7 +3,7 @@ timeout: 3000s
 options:
   substitution_option: ALLOW_LOOSE
 steps:
-  - name: 'gcr.io/k8s-testimages/gcb-docker-gcloud:v20210722-085d930'
+  - name: 'gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20211013-1be7868d8b'
     entrypoint: make
     env:
       - DOCKER_CLI_EXPERIMENTAL=enabled