Drop Python 3.8 branches (#13776)

stdlib/pkgutil.pyi

@@ -48,6 +48,4 @@ def walk_packages(
     path: Iterable[StrOrBytesPath] | None = None, prefix: str = "", onerror: Callable[[str], object] | None = None
 ) -> Iterator[ModuleInfo]: ...
 def get_data(package: str, resource: str) -> bytes | None: ...
-
-if sys.version_info >= (3, 9):
-    def resolve_name(name: str) -> Any: ...
+def resolve_name(name: str) -> Any: ...