Updating openshift-enterprise-tests-container image to be consistent with ART

Reconciling with https://github.com/openshift/ocp-build-data/tree/e5df10e41b14c724468c8f78e2690f219279bfc4/images/openshift-enterprise-tests.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-4.15
+  tag: rhel-8-release-golang-1.20-openshift-4.16

images/tests/Dockerfile.rhel

@@ -1,11 +1,11 @@
-FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.20-openshift-4.15 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.20-openshift-4.16 AS builder
 WORKDIR /go/src/github.com/openshift/origin
 COPY . .
 RUN make; \
     mkdir -p /tmp/build; \
     cp /go/src/github.com/openshift/origin/openshift-tests /tmp/build/openshift-tests
 
-FROM registry.ci.openshift.org/ocp/4.15:tools
+FROM registry.ci.openshift.org/ocp/4.16:tools
 COPY --from=builder /tmp/build/openshift-tests /usr/bin/
 RUN PACKAGES="git gzip util-linux" && \
     if [ $HOSTTYPE = x86_64 ] || [ $HOSTTYPE = ppc64le ]; then PACKAGES="$PACKAGES python3-cinderclient"; fi && \