Updating ose-machine-api-provider-gcp-container image to be consisten…

…t with ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/9dc2a375bf335e7e4e3d7e75abc5c3bdbb0c0e98/images/ose-machine-api-provider-gcp.yml

.ci-operator.yaml

@@ -1,4 +1,4 @@
 build_root_image:
   name: release
   namespace: openshift
-  tag: rhel-8-release-golang-1.20-openshift-4.15
+  tag: rhel-9-release-golang-1.20-openshift-4.15

Dockerfile.rhel

@@ -1,10 +1,10 @@
-FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.20-openshift-4.15 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.20-openshift-4.15 AS builder
 WORKDIR /go/src/github.com/openshift/machine-api-provider-gcp
 COPY . .
 # VERSION env gets set in the openshift/release image and refers to the golang version, which interfers with our own
 RUN unset VERSION \
  && make build GOPROXY=off NO_DOCKER=1 CGO_ENABLED=0
 
-FROM registry.ci.openshift.org/ocp/4.15:base
+FROM registry.ci.openshift.org/ocp/4.15:base-rhel9
 COPY --from=builder /go/src/github.com/openshift/machine-api-provider-gcp/bin/machine-controller-manager /
 COPY --from=builder /go/src/github.com/openshift/machine-api-provider-gcp/bin/termination-handler /