Add __all__ for modules beginning with 'u', 'x', 'w' and 'z' (#7374)

stdlib/wsgiref/util.pyi

@@ -3,6 +3,8 @@ from typing import IO, Any, Callable
 
 from .types import WSGIEnvironment
 
+__all__ = ["FileWrapper", "guess_scheme", "application_uri", "request_uri", "shift_path_info", "setup_testing_defaults"]
+
 class FileWrapper:
     filelike: IO[bytes]
     blksize: int