3.12 Checks, source clean up
A minor update that includes some code cleanup (flake8 and black), removing some unneeded dependences, etc.
What's Changed
- Add a PHYSLITE file to testing by @gordonwatts in #210
- CI/Tests failing by @gordonwatts in #215
- fix: Remove deleted codecov Python package dependency by @matthewfeickert in #213
- Move to 3.12 by @gordonwatts in #216
Full Changelog: 2.1.1...2.1.2