Update k8s dependencies to v1.22.0-rc.0

vendor/google.golang.org/protobuf/reflect/protodesc/desc_validate.go

@@ -239,6 +239,9 @@ func validateExtensionDeclarations(xs []filedesc.Extension, xds []*descriptorpb.
 			return errors.New("extension field %q has an invalid cardinality: %d", x.FullName(), x.Cardinality())
 		}
 		if xd.JsonName != nil {
+			// A bug in older versions of protoc would always populate the
+			// "json_name" option for extensions when it is meaningless.
+			// When it did so, it would always use the camel-cased field name.
 			if xd.GetJsonName() != strs.JSONCamelCase(string(x.Name())) {
 				return errors.New("extension field %q may not have an explicitly set JSON name: %q", x.FullName(), xd.GetJsonName())
 			}