chore: bump gcb-docker-gcloud

Since #800 upgraded the project to Go 1.25.0 and addressed a Go toolchain bug, we need to ensure that our build environment also provides Go 1.25.x or newer.

gcb-docker-gcloud:v20251110-7ccd542560 ships with go 1.25.4

Signed-off-by: Bruno Schaatsbergen <[email protected]>

Author: bschaatsbergen

dev/ci/builds/push-images/cloudbuild.yaml

@@ -3,7 +3,7 @@ options:
   substitution_option: ALLOW_LOOSE
   machineType: E2_HIGHCPU_32
 steps:
-- name: gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20250513-9264efb079
+- name: gcr.io/k8s-staging-test-infra/gcb-docker-gcloud:v20251110-7ccd542560
   entrypoint: dev/tasks/push-images
   env:
   - IMAGE_PREFIX=us-central1-docker.pkg.dev/k8s-staging-images/kro/