stdlib: Improve a bunch of __(a)exit__ methods (#7571)

stdlib/asyncio/locks.pyi

@@ -25,7 +25,7 @@ else:
     class _ContextManager:
         def __init__(self, lock: Lock | Semaphore) -> None: ...
         def __enter__(self) -> None: ...
-        def __exit__(self, *args: Any) -> None: ...
+        def __exit__(self, *args: object) -> None: ...
 
     class _ContextManagerMixin:
         # Apparently this exists to *prohibit* use as a context manager.