Updating golang-github-openshift-oauth-proxy images to be consistent with ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/ed337d94faaaa3782fcccf3a54d9a2256ba2aa9b/images/golang-github-openshift-oauth-proxy.yml

Author: AOS Automation Release Team

.ci-operator.yaml

@@ -1,5 +1,4 @@
 build_root_image:
   name: release
   namespace: openshift
-  tag: rhel-8-release-golang-1.20-openshift-4.14
-
+  tag: rhel-8-release-golang-1.20-openshift-4.15

Dockerfile

@@ -1,8 +1,8 @@
-FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.20-openshift-4.14 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.20-openshift-4.15 AS builder
 WORKDIR  /go/src/github.com/openshift/oauth-proxy
 COPY . .
 RUN go build .
 
-FROM registry.ci.openshift.org/ocp/builder:rhel-8-base-openshift-4.14
+FROM registry.ci.openshift.org/ocp/builder:rhel-8-base-openshift-4.15
 COPY --from=builder /go/src/github.com/openshift/oauth-proxy/oauth-proxy /usr/bin/oauth-proxy
 ENTRYPOINT ["/usr/bin/oauth-proxy"]