Fix KubeMismatchVersion error in GKE

manifests/grafana-deployment.yaml

@@ -1,4 +1,4 @@
-apiVersion: apps/v1beta2
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   labels:

manifests/prometheus-rules.yaml

@@ -726,7 +726,7 @@ spec:
           components running.
         runbook_url: https://github.com/kubernetes-monitoring/kubernetes-mixin/tree/master/runbook.md#alert-name-kubeversionmismatch
       expr: |
-        count(count by (gitVersion) (label_replace(kubernetes_build_info{job!="kube-dns"},"gitVersion","$1","gitVersion","(v[0-9]*.[0-9]*.[0-9]*).*"))) > 1
+        count(count by (gitVersion) (label_replace(kubernetes_build_info{job!~"kube-dns|coredns"},"gitVersion","$1","gitVersion","(v[0-9]*.[0-9]*.[0-9]*).*"))) > 1
       for: 1h
       labels:
         severity: warning