Update registry.access.redhat.com/ubi8/ubi-minimal Docker tag to v8.7-923 (elastic#6153)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile.ubi

@@ -24,7 +24,7 @@ RUN CGO_ENABLED=0 GOOS=linux \
       -o elastic-operator github.com/elastic/cloud-on-k8s/v2/cmd
 
 # Copy the operator binary into a lighter image
-FROM registry.access.redhat.com/ubi8/ubi-minimal:8.6-994
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.7-923
 
 # Update the base image packages to the latest versions
 RUN microdnf update --setopt=tsflags=nodocs && microdnf clean all

hack/deployer/clients/ocp/Dockerfile

@@ -12,6 +12,6 @@ RUN curl -fsSLO https://mirror.openshift.com/pub/openshift-v4/clients/ocp/${CLIE
     mv oc /usr/local/bin/oc && \
     rm openshift-client-linux-${CLIENT_VERSION}.tar.gz
 
-FROM registry.access.redhat.com/ubi8/ubi-minimal:8.6-994
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.7-923
 COPY --from=builder /usr/local/bin/openshift-install .
 COPY --from=builder /usr/local/bin/oc .