Use the latest apiVersion in k8s-v1.14.x

recipes/metrics-server/auth-delegator.yaml

 ---
-apiVersion: rbac.authorization.k8s.io/v1beta1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: ClusterRoleBinding
 metadata:
   name: metrics-server:system:auth-delegator

recipes/metrics-server/auth-reader.yaml

 ---
-apiVersion: rbac.authorization.k8s.io/v1beta1
+apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding
 metadata:
   name: metrics-server-auth-reader

recipes/metrics-server/metrics-apiservice.yaml

 ---
-apiVersion: apiregistration.k8s.io/v1beta1
+apiVersion: apiregistration.k8s.io/v1
 kind: APIService
 metadata:
   name: v1beta1.metrics.k8s.io

recipes/metrics-server/metrics-server-deployment.yaml

@@ -5,7 +5,7 @@ metadata:
   name: metrics-server
   namespace: kube-system
 ---
-apiVersion: extensions/v1beta1
+apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: metrics-server