Update typing_extensions imports in stdlib (#11244)

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

stdlib/http/__init__.pyi

@@ -1,6 +1,6 @@
 import sys
 from enum import IntEnum
-from typing_extensions import Literal
+from typing import Literal
 
 if sys.version_info >= (3, 11):
     from enum import StrEnum