Also remove the obsolete comment.

Author: rwgk

tests/test_modules.py

@@ -108,10 +108,6 @@ def test_def_submodule_failures():
         sm.__name__ = malformed_utf8
         try:
             with pytest.raises(SystemError):
-                # Seen with Python 3.9: SystemError: nameless module
-                # But we do not want to exercise the internals of PyModule_GetName(), which could
-                # change in future versions of Python, but a bad __name__ is very likely to cause
-                # some kind of failure indefinitely.
                 m.def_submodule(sm, b"SubSubModuleName")
         finally:
             # Clean up to ensure nothing gets upset by a module with an invalid __name__.