Bump snapshotter to v1.2.2 for CVE fix

Author: davidz627

deploy/kubernetes/overlays/alpha/controller_add_snapshotter.yaml

@@ -8,7 +8,7 @@ spec:
       containers:
         - name: csi-snapshotter
           imagePullPolicy: Always
-          image: gke.gcr.io/csi-snapshotter:v1.2.0-gke.0
+          image: gke.gcr.io/csi-snapshotter:v1.2.2-gke.0
           args:
             - "--v=5"
             - "--csi-address=/csi/csi.sock"