Update infra/gcp/bash/ensure-staging-gcb-untrusted.sh
Update infra/gcp/bash/ensure-staging-gcb-untrusted.sh

Co-authored-by: Arnaud M. <96190fcd0798f0afa72279990e31ddc33e4f2ea2@gmail.com>
kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io,kubernetes/k8s.io