async def delete_artifact(
      self, *, app_name: str, user_id: str, session_id: str, filename: str
  ) -> None:
    """Deletes an artifact.

    Args:
        app_name: The name of the application.
        user_id: The ID of the user.
        session_id: The ID of the session.
        filename: The name of the artifact file.
    """
Deletes an artifact.

    Args:
        app_name: The name of the application.
        user_id: The ID of the user.
        session_id: The ID of the session.
        filename: The name of the artifact file.
    
src/google/adk/artifacts/base_artifact_service.py