Drop Python 3.8 support in typing[_extensions] and types (#13763)

stdlib/@tests/test_cases/typing/check_all.py

@@ -4,11 +4,9 @@ This tests that star imports work when using "all += " syntax.
 """
 from __future__ import annotations
 
-import sys
 from typing import *
 from zipfile import *
 
-if sys.version_info >= (3, 9):
-    x: Annotated[int, 42]
+x: Annotated[int, 42]
 
 p: Path