Import Match and Pattern from re, not typing (#8277)

stdlib/string.pyi

@@ -1,13 +1,8 @@
 import sys
 from collections.abc import Iterable, Mapping, Sequence
-from re import RegexFlag
+from re import Pattern, RegexFlag
 from typing import Any
 
-if sys.version_info >= (3, 8):
-    from re import Pattern
-else:
-    from typing import Pattern
-
 __all__ = [
     "ascii_letters",
     "ascii_lowercase",