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

stdlib/os/__init__.pyi

@@ -1021,7 +1021,7 @@ if sys.version_info >= (3, 8):
             def __init__(self, path: str | None, cookie: _T, remove_dll_directory: Callable[[_T], Any]) -> None: ...
             def close(self) -> None: ...
             def __enter__(self: Self) -> Self: ...
-            def __exit__(self, *args: Any) -> None: ...
+            def __exit__(self, *args: object) -> None: ...
 
         def add_dll_directory(path: str) -> _AddedDllDirectory: ...
     if sys.platform == "linux":