Fix typing annotation

Signed-off-by: Francisco Rossi <frossi@ekumenlabs.com>

Author: frneer

rosidl_cli/rosidl_cli/cli.py

@@ -26,7 +26,7 @@ def add_subparsers(
     parser: argparse.ArgumentParser,
     cli_name: str,
     commands: List[Union[GenerateCommand, TranslateCommand]]
-) -> argparse._SubParsersAction[argparse.ArgumentParser]:
+) -> argparse._SubParsersAction:
     """
     Create argparse subparser for each command.