remove leftover bits of Python2 support

[a-detiste]

Description:

Related issue (if applicable): my weird OCD's

Checklist

• [x] The code change is tested and works locally.
• [x] There is no commented out code in this PR.
• [x] No lint errors (use flake8)
• [x] 100% test coverage

[codecov-commenter]

Codecov Report

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

Comparison is base (a25ff00) 99.51% compared to head (b84c3eb) 99.51%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1012 +/- ## ========================================== - Coverage 99.51% 99.51% -0.01% ========================================== Files 126 126 Lines 16868 16857 -11 Branches 3457 3457 ========================================== - Hits 16787 16776 -11 Misses 70 70 Partials 11 11 ```

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[caronc]

Thank you!!🚀