Bump version of GH actions and python version

[rbikar]

• bumped version of GH actions
• testing now happens on py312
• fix styling and pylint issues
• removed some remnants of python2

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.66%. Comparing base (de87b97) to head (7e4c035).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #228 +/- ## ========================================== - Coverage 98.78% 98.66% -0.13% ========================================== Files 7 7 Lines 820 821 +1 ========================================== Hits 810 810 - Misses 10 11 +1 ```

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[rbikar]

run tests

[rbikar]

the codecov/project failed check can be dismissed there were no related change in this PR.