Upgrade black version (#7089)

stdlib/wsgiref/util.pyi

@@ -10,6 +10,7 @@ class FileWrapper:
     def __init__(self, filelike: IO[bytes], blksize: int = ...) -> None: ...
     if sys.version_info < (3, 11):
         def __getitem__(self, key: Any) -> bytes: ...
+
     def __iter__(self) -> FileWrapper: ...
     def __next__(self) -> bytes: ...