Update typing_extensions imports in stdlib (#11244)

Co-authored-by: AlexWaygood <alex.waygood@gmail.com>

stdlib/sunau.pyi

@@ -1,7 +1,7 @@
 import sys
 from _typeshed import Unused
-from typing import IO, Any, NamedTuple, NoReturn, overload
-from typing_extensions import Literal, Self, TypeAlias
+from typing import IO, Any, Literal, NamedTuple, NoReturn, overload
+from typing_extensions import Self, TypeAlias
 
 _File: TypeAlias = str | IO[bytes]