use TextIOWrapper for sys.__stdin__, sys.__stdout__, sys.__stderr__ (#5623)

stdlib/sys.pyi

@@ -2,6 +2,7 @@ import sys
 from builtins import object as _object
 from importlib.abc import Loader, PathEntryFinder
 from importlib.machinery import ModuleSpec
+from io import TextIOWrapper
 from types import FrameType, ModuleType, TracebackType
 from typing import (
     Any,
@@ -79,9 +80,9 @@ stdout: TextIO
 stderr: TextIO
 if sys.version_info >= (3, 10):
     stdlib_module_names: FrozenSet[str]
-__stdin__: TextIO
-__stdout__: TextIO
-__stderr__: TextIO
+__stdin__: TextIOWrapper
+__stdout__: TextIOWrapper
+__stderr__: TextIOWrapper
 tracebacklimit: int
 version: str
 api_version: int