Stdlib: add some very large integer defaults (#9651)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

stdlib/asyncio/windows_events.pyi

@@ -42,7 +42,7 @@ if sys.platform == "win32":
         ) -> list[PipeServer]: ...
 
     class IocpProactor:
-        def __init__(self, concurrency: int = ...) -> None: ...
+        def __init__(self, concurrency: int = 0xFFFFFFFF) -> None: ...
         def __del__(self) -> None: ...
         def set_loop(self, loop: events.AbstractEventLoop) -> None: ...
         def select(self, timeout: int | None = None) -> list[futures.Future[Any]]: ...