Use PEP 570 syntax in stdlib (#11250)

stdlib/_thread.pyi

@@ -54,6 +54,6 @@ if sys.version_info >= (3, 12):
     def daemon_threads_allowed() -> bool: ...
 
 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: ...