Update tests/functional/g/generic_alias/generic_alias_mixed_py39.py

Author: Pierre-Sassoulas

tests/functional/g/generic_alias/generic_alias_mixed_py39.py

@@ -15,7 +15,7 @@
 var_iterable: collections.abc.Iterable[int]
 var_awaitable: collections.abc.Awaitable[int]
 var_pattern: re.Pattern[int]
-var_bytestring: collections.abc.ByteString # >=3.14: [no-member]
+var_bytestring: collections.abc.ByteString
 var_hashable: collections.abc.Hashable
 var_context_manager: contextlib.AbstractContextManager[int]