pytype: disable covariant `TypeVar` not supported yet

python/_build/protoc-gen-custom_grpc

diff --git a/python/_build/protoc-gen-custom_grpc b/python/_build/protoc-gen-custom_grpc
index 1c620c5..f03a0c8 100755
--- a/python/_build/protoc-gen-custom_grpc
+++ b/python/_build/protoc-gen-custom_grpc
@@ -467,7 +467,7 @@
 from typing import Any, AsyncIterable, AsyncIterator, Generic, Iterator, TypeVar
 
 
-_T_co = TypeVar('_T_co', covariant=True)
+_T_co = TypeVar('_T_co', covariant=True)  # pytype: disable=not-supported-yet
 _T = TypeVar('_T')