Change v1beta1 to v1 to unblock GKE upgrades (#1099)

GKE v1beta1 is deprecated and clusters with these resources are
blocked from upgrading automatically.

Author: Saied Kazemi

k8s/data-processing/persistentvolumes/storage-class.yml

@@ -1,12 +1,12 @@
-apiVersion: storage.k8s.io/v1beta1
+apiVersion: storage.k8s.io/v1
 kind: StorageClass
 metadata:
   name: slow
 provisioner: kubernetes.io/gce-pd
 parameters:
   type: pd-standard
 ---
-apiVersion: storage.k8s.io/v1beta1
+apiVersion: storage.k8s.io/v1
 kind: StorageClass
 metadata:
   name: fast