Updating kube-proxy-container image to be consistent with ART for 4.18

Reconciling with https://github.com/openshift/ocp-build-data/tree/827ab4ccce9cbbcf82c9dbaf6398b61d6cff8d7a/images/kube-proxy.yml

.ci-operator.yaml

@@ -1,4 +1,4 @@
 build_root_image:
   name: release
   namespace: openshift
-  tag: rhel-9-release-golang-1.22-openshift-4.17
+  tag: rhel-9-release-golang-1.22-openshift-4.18

images/kube-proxy/Dockerfile.rhel

@@ -1,9 +1,9 @@
-FROM registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.22-openshift-4.17 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.22-openshift-4.18 AS builder
 WORKDIR /go/src/github.com/openshift/sdn
 COPY . .
 RUN make build GO_BUILD_PACKAGES=./vendor/k8s.io/kubernetes/cmd/kube-proxy --warn-undefined-variables
 
-FROM registry.ci.openshift.org/ocp/4.17:base-rhel9
+FROM registry.ci.openshift.org/ocp/4.18:base-rhel9
 RUN INSTALL_PKGS="conntrack-tools iptables nftables" && \
     yum install -y --setopt=tsflags=nodocs $INSTALL_PKGS && \
     yum clean all && rm -rf /var/cache/*