Switch to uv

[MelissaAutumn]

Low priority!

We should switch over from pip to uv
https://docs.astral.sh/uv/

It should be a fairly easy switch, we'll just need to uv sync the directory and commit the lock file.

Then whenever we want to add a project to requirements we'll just need to use uv add instead of pip install.

We'll have to adjust our docker container to also use uv or convert the lockfile on the fly with uv export --format requirements-txt.