Update CI image references to latest k8s-builder
Summary
Updating k8s-util stages to use latest "k8s-builder" image to fix nightly master pipeline run.
UNCLASSIFIED - NO CUI
ATTENTION: Immediate action is required to maintain compatibility with P1 services. Please visit https://p1notifications.dso.mil and see the "DSO.MIL Certificates Renewal" announcement under the "Notifications" section for more details.
Summary
Updating k8s-util stages to use latest "k8s-builder" image to fix nightly master pipeline run.
UNCLASSIFIED - NO CUI