Updating openshift-enterprise-builder images to be consistent with ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/8c7933b4665d68a762dff58103081a34f19a4b89/images/openshift-enterprise-builder.yml

.ci-operator.yaml

@@ -1,4 +1,4 @@
 build_root_image:
   name: release
   namespace: openshift
-  tag: rhel-8-release-golang-1.18-openshift-4.11
+  tag: rhel-8-release-golang-1.18-openshift-4.12

Dockerfile.rhel8

@@ -1,9 +1,9 @@
-FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.18-openshift-4.11 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.18-openshift-4.12 AS builder
 WORKDIR /go/src/github.com/openshift/builder
 COPY . .
 RUN hack/build.sh
 
-FROM registry.ci.openshift.org/ocp/builder:rhel-8-base-openshift-4.11
+FROM registry.ci.openshift.org/ocp/builder:rhel-8-base-openshift-4.12
 RUN INSTALL_PKGS=" \
       bind-utils bsdtar findutils fuse-overlayfs git hostname lsof \
       procps-ng runc socat tar tree util-linux wget which \