Merge pull request #68 from openshift-bot/art-consistency-openshift-4…

….8-openshift-state-metrics

Updating openshift-state-metrics 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/openshift-state-metrics
 COPY . .
 RUN make build