Use builtin TimeoutError in asyncio and concurrent.futures (#11109)

related to https://github.com/python/typeshed/issues/3968

Co-authored-by: Stephen Morton <git@tungol.org>

stdlib/asyncio/exceptions.pyi

@@ -21,7 +21,12 @@ else:
     )
 
 class CancelledError(BaseException): ...
-class TimeoutError(Exception): ...
+
+if sys.version_info >= (3, 11):
+    from builtins import TimeoutError as TimeoutError
+else:
+    class TimeoutError(Exception): ...
+
 class InvalidStateError(Exception): ...
 class SendfileNotAvailableError(RuntimeError): ...