Updating ose-installer-container image to be consistent with ART for 4.21

Reconciling with https://github.com/openshift/ocp-build-data/tree/4fbe3fab45239dc4be6f5d9d98a0bf36e0274ec9/images/ose-installer.yml

Author: AOS Automation Release Team

.ci-operator.yaml

@@ -1,4 +1,4 @@
 build_root_image:
   name: release
   namespace: openshift
-  tag: rhel-9-release-golang-1.24-openshift-4.20
+  tag: rhel-9-release-golang-1.24-openshift-4.21

images/installer/Dockerfile.ci

@@ -2,10 +2,10 @@
 # It builds an image containing only the openshift-install.
 
 # We copy from the -artifacts images because they are statically linked
-FROM registry.ci.openshift.org/ocp/4.20:installer-kube-apiserver-artifacts AS kas-artifacts
-FROM registry.ci.openshift.org/ocp/4.20:installer-etcd-artifacts AS etcd-artifacts
+FROM registry.ci.openshift.org/ocp/4.21:installer-kube-apiserver-artifacts AS kas-artifacts
+FROM registry.ci.openshift.org/ocp/4.21:installer-etcd-artifacts AS etcd-artifacts
 
-FROM registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.24-openshift-4.20 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.24-openshift-4.21 AS builder
 # FIPS support is offered via the baremetal-installer image
 ENV GO_COMPLIANCE_EXCLUDE=".*"
 ARG TAGS=""
@@ -19,7 +19,7 @@ RUN mkdir -p cluster-api/bin/$(go env GOOS)_$(go env GOHOSTARCH) && \
 RUN DEFAULT_ARCH="$(go env GOHOSTARCH)" hack/build.sh
 RUN go run -mod=vendor hack/build-coreos-manifest.go
 
-FROM registry.ci.openshift.org/ocp/4.20:base-rhel9
+FROM registry.ci.openshift.org/ocp/4.21:base-rhel9
 
 COPY --from=builder /go/src/github.com/openshift/installer/bin/openshift-install /bin/openshift-install
 COPY --from=builder /go/src/github.com/openshift/installer/bin/manifests/ /manifests/