Bumping all images to latest versions for 0.6.0 stable release

Author: verult

deploy/kubernetes/overlays/stable/kustomization.yaml

@@ -7,13 +7,13 @@ images:
   # Don't change stable image without changing pdImagePlaceholder in
   # test/k8s-integration/main.go
   newName: gke.gcr.io/gcp-compute-persistent-disk-csi-driver
-  newTag: "v0.5.1-gke.0"
+  newTag: "v0.6.0-gke.0"
 - name: gke.gcr.io/csi-provisioner
   newName: gke.gcr.io/csi-provisioner
-  newTag: "v1.2.1-gke.0"
+  newTag: "v1.4.0-gke.0"
 - name: gke.gcr.io/csi-attacher
   newName: gke.gcr.io/csi-attacher
-  newTag: "v1.2.1-gke.0"
+  newTag: "v2.0.0-gke.0"
 - name: gke.gcr.io/csi-node-driver-registrar
   newName: gke.gcr.io/csi-node-driver-registrar
-  newTag: "v1.1.0-gke.0"
+  newTag: "v1.2.0-gke.0"