Updating ose-cluster-kube-storage-version-migrator-operator builder &…

… base images to be consistent with ART

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

images/ci/Dockerfile

@@ -1,9 +1,9 @@
-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-kube-storage-version-migrator-operator
 COPY . .
 RUN make build --warn-undefined-variables
 
-FROM registry.svc.ci.openshift.org/ocp/4.6:base
+FROM registry.svc.ci.openshift.org/ocp/4.7:base
 COPY --from=builder /go/src/github.com/openshift/cluster-kube-storage-version-migrator-operator/cluster-kube-storage-version-migrator-operator /usr/bin/
 COPY manifests /manifests
 COPY vendor/github.com/openshift/api/operator/v1/*_kube-storage-version-migrator-operator_*.yaml* /manifests