Update k8s dependency version to 1.21

Signed-off-by: xinyanwu409 <wxinyan@vmware>

vendor/k8s.io/api/storage/v1alpha1/zz_generated.deepcopy.go

@@ -41,6 +41,11 @@ func (in *CSIStorageCapacity) DeepCopyInto(out *CSIStorageCapacity) {
 		x := (*in).DeepCopy()
 		*out = &x
 	}
+	if in.MaximumVolumeSize != nil {
+		in, out := &in.MaximumVolumeSize, &out.MaximumVolumeSize
+		x := (*in).DeepCopy()
+		*out = &x
+	}
 	return
 }