Updating ose-gcp-pd-csi-driver images to be consistent with ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/da6a5af1fa96762cc8410f09fc28c0457280f59a/images/ose-gcp-pd-csi-driver.yml

Author: AOS Automation Release Team

.ci-operator.yaml

@@ -1,4 +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.openshift

@@ -1,10 +1,10 @@
-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/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver
 COPY . .
 # Skip Windows driver build
 RUN make gce-pd-driver
 
-FROM registry.ci.openshift.org/ocp/4.14:base
+FROM registry.ci.openshift.org/ocp/4.15:base
 
 # Get all deps
 # nvme-cli and /usr/bin/xxd are deps of google_nvme_id