black 23.1.0 introduces breaking changes

[christophfink]

On the updated runners that use the python:3 docker image, our code does not pass linting, as black updated its style for 2023 last night. This has not yet arrived in conda, but is in pip (so the GitHub Action runners check for the new style)

see https://github.com/psf/black/releases/tag/23.1.0

this is the one that affects our code: psf/black#2945 , see https://github.com/r5py/r5py/actions/runs/4062655304/jobs/6994094010

[christophfink]

See also #249