Remove Python 3.7 branches (#11238)

stdlib/urllib/robotparser.pyi

@@ -1,4 +1,3 @@
-import sys
 from collections.abc import Iterable
 from typing import NamedTuple
 
@@ -18,5 +17,4 @@ class RobotFileParser:
     def modified(self) -> None: ...
     def crawl_delay(self, useragent: str) -> str | None: ...
     def request_rate(self, useragent: str) -> RequestRate | None: ...
-    if sys.version_info >= (3, 8):
-        def site_maps(self) -> list[str] | None: ...
+    def site_maps(self) -> list[str] | None: ...