Audit stdlib object annotations (#9519)

stdlib/os/__init__.pyi

@@ -15,6 +15,7 @@ from _typeshed import (
     StrOrBytesPath,
     StrPath,
     SupportsLenAndGetItem,
+    Unused,
     WriteableBuffer,
     structseq,
 )
@@ -730,7 +731,7 @@ def rmdir(path: StrOrBytesPath, *, dir_fd: int | None = ...) -> None: ...
 
 class _ScandirIterator(Iterator[DirEntry[AnyStr]], AbstractContextManager[_ScandirIterator[AnyStr]]):
     def __next__(self) -> DirEntry[AnyStr]: ...
-    def __exit__(self, *args: object) -> None: ...
+    def __exit__(self, *args: Unused) -> None: ...
     def close(self) -> None: ...
 
 @overload
@@ -997,7 +998,7 @@ if sys.version_info >= (3, 8):
             def __init__(self, path: str | None, cookie: _T, remove_dll_directory: Callable[[_T], object]) -> None: ...
             def close(self) -> None: ...
             def __enter__(self: Self) -> Self: ...
-            def __exit__(self, *args: object) -> None: ...
+            def __exit__(self, *args: Unused) -> None: ...
 
         def add_dll_directory(path: str) -> _AddedDllDirectory: ...
     if sys.platform == "linux":