remove leftover bits of Python2 support

[a-detiste]

Description:

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

Checklist

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

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Additional details and impacted files

@@            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!!🚀