Remove Python 3.7 branches (#11238)

stubs/entrypoints/entrypoints.pyi

@@ -1,14 +1,9 @@
-import sys
 from collections.abc import Iterator, Sequence
 from configparser import ConfigParser
+from re import Pattern
 from typing import Any
 from typing_extensions import Self
 
-if sys.version_info >= (3, 8):
-    from re import Pattern
-else:
-    from re import Pattern
-
 entry_point_pattern: Pattern[str]
 file_in_zip_pattern: Pattern[str]