Updating cluster-version-operator builder & base images to be consistent with ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/ac81dd4ff0bd57c4e75058d25b40615b92948259/images/cluster-version-operator.yml

Author: jupierce

Dockerfile.rhel

@@ -1,11 +1,11 @@
-FROM registry.svc.ci.openshift.org/ocp/builder:rhel-8-golang-1.15-openshift-4.6 AS builder
+FROM registry.svc.ci.openshift.org/ocp/builder:rhel-8-golang-1.15-openshift-4.7 AS builder
 WORKDIR /go/src/github.com/openshift/cluster-version-operator
 COPY . .
 RUN hack/build-go.sh; \
     mkdir -p /tmp/build; \
     cp _output/linux/$(go env GOARCH)/cluster-version-operator /tmp/build/cluster-version-operator
 
-FROM registry.svc.ci.openshift.org/ocp/4.6:base
+FROM registry.svc.ci.openshift.org/ocp/4.7:base
 COPY --from=builder /tmp/build/cluster-version-operator /usr/bin/
 COPY install /manifests
 COPY vendor/github.com/openshift/api/config/v1/0000_00_cluster-version-operator_01_clusterversion.crd.yaml /manifests/