Fix positional-only differences in threading.local (#7227)

Last one of these, I think.

Author: AlexWaygood

stdlib/threading.pyi

@@ -114,9 +114,9 @@ TIMEOUT_MAX: float
 class ThreadError(Exception): ...
 
 class local:
-    def __getattribute__(self, name: str) -> Any: ...
-    def __setattr__(self, name: str, value: Any) -> None: ...
-    def __delattr__(self, name: str) -> None: ...
+    def __getattribute__(self, __name: str) -> Any: ...
+    def __setattr__(self, __name: str, __value: Any) -> None: ...
+    def __delattr__(self, __name: str) -> None: ...
 
 class Thread:
     name: str