Stdlib: add container default values (#9909)

stdlib/shutil.pyi

@@ -182,4 +182,4 @@ def register_unpack_format(
 ) -> None: ...
 def unregister_unpack_format(name: str) -> None: ...
 def get_unpack_formats() -> list[tuple[str, list[str], str]]: ...
-def get_terminal_size(fallback: tuple[int, int] = ...) -> os.terminal_size: ...
+def get_terminal_size(fallback: tuple[int, int] = (80, 24)) -> os.terminal_size: ...