Use `ruff format ...` in addition to `ruff check ... --fix` via Nox

Is your feature request related to a problem? Please describe.

Our format Nox session only uses ruff check [files] --fix to "format" our codebase:

However, this is a misunderstanding of the ruff check command, as it only fixes any critical thing, but no formatting happens at all.

Describe the solution you'd like

Adding a session.run call to this function:

to run the ruff format command on our files. It's not necessary to delete the ruff check --fix line, as it could be useful too.

Describe alternatives you've considered

Stick to the check --fix-only formatting, but this is not recommended.

Additional context

This is a Good First Issue, so I'd love to see a new contributor taking on this ticket!

If you need help with coding Nox sessions, you might find this documentation useful :hugs:

DiddiLeija / diddi-and-the-bugs