make-doc failing

[mikez]

see https://github.com/thingsapi/things.py/actions/runs/15507671241/job/43664522875

Unclear if a temporary thing or a permanent error; might also be an opportunity to move to pyproject.toml. Is this easy by using an AI tool?

/cc @AlexanderWillner

[AlexanderWillner]

there are many things I'd change in the GitHub Actions file, #140 is a quick fix for the current issue