Updating kuryr-cni images to be consistent with ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/ed337d94faaaa3782fcccf3a54d9a2256ba2aa9b/images/kuryr-cni.yml

.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

openshift-kuryr-cni-rhel8.Dockerfile

@@ -1,11 +1,11 @@
-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/kuryr-kubernetes
 COPY . .
 WORKDIR /go/src/github.com/openshift/kuryr-kubernetes/kuryr_cni
 RUN go build -o /go/bin/kuryr-cni ./pkg
 
-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
 
 ENV container=oci
 ARG OSLO_LOCK_PATH=/var/kuryr-lock