Cannot pass pyproject.toml to --config argument

`autoflake` without passing path for any config file tries to parse both `pyproject.toml` and `setup.cfg`:
https://github.com/PyCQA/autoflake/blob/v2.2.1/autoflake.py#L1211

But `autoflake --config some.file` can handle only `setup.cfg` format:
https://github.com/PyCQA/autoflake/blob/v2.2.1/autoflake.py#L1255

Is it possible to add check for file type by its extension?

