Bump gcb-docker-gcloud image to v20260127-c1affcc8de (#843)

The previously pinned builder image tag v20240718-5ef92b5c36 has been
removed from gcr.io, causing the post-lws-push-images Prow job to fail
with 'manifest unknown: Failed to fetch'. Bump to the tag currently used
by sibling project Kueue to restore image publishing on main.

Signed-off-by: Kay Yan <kay.yan@daocloud.io>