Updating ose-machine-api-provider-aws-container image to be consistent with ART for 4.21

Reconciling with https://github.com/openshift/ocp-build-data/tree/4fbe3fab45239dc4be6f5d9d98a0bf36e0274ec9/images/ose-machine-api-provider-aws.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

Dockerfile.rhel

@@ -1,11 +1,11 @@
-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
 WORKDIR /go/src/github.com/openshift/machine-api-provider-aws
 COPY . .
 # VERSION env gets set in the openshift/release image and refers to the golang version, which interfers with our own
 RUN unset VERSION \
  && GOPROXY=off NO_DOCKER=1 make build
 
-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/machine-api-provider-aws/bin/machine-controller-manager /
 COPY --from=builder /go/src/github.com/openshift/machine-api-provider-aws/bin/termination-handler /