Merge pull request #28 from openshift-bot/art-consistency-openshift-4…

….8-ose-mdns-publisher

Updating ose-mdns-publisher builder & base images to be consistent with ART

Dockerfile

@@ -1,4 +1,4 @@
-FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.15-openshift-4.8 AS builder
+FROM registry.ci.openshift.org/ocp/builder:rhel-8-golang-1.16-openshift-4.8 AS builder
 WORKDIR /go/src/github.com/openshift/mdns-publisher
 COPY . .
 RUN GO111MODULE=on go build --mod=vendor