Tox to Nox

[MichaelSasser]

Affected Handlers

None

Description of Change

• Replace tox as dependency with nox
• Update PR template
• Create noxfile.py
• Remove tox config from `pyproject.toml?
• Remove unneeded dev dependencies.

Checklist

• Have you checked, to ensure, there aren't other open Pull Requests for the same update/change?
• Have you created an issue first?
• Have you added or changed tests for your code?
• Have you documented your changes?
• Have you created a newsfragment in ./news/?
• I haven't added any dependencies without approval.
• Did you ran nox and everything passed?

I have read and accept the

• Code of Conduct & Contribution Guidlines