chore: drop python 3.6

[mayeut]

Drop python 3.6, it's been EOL for almost 1 year.
It doesn't prevent repairing 3.6 wheels (or older)

[codecov]

Codecov Report

Base: 92.45% // Head: 92.45% // No change to project coverage 👍

Coverage data is based on head (404a1b3) compared to base (330f68c).
Patch has no changes to coverable lines.

❗ Current head 404a1b3 differs from pull request most recent head c829e2a. Consider uploading reports for the commit c829e2a to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #400   +/-   ##
=======================================
  Coverage   92.45%   92.45%           
=======================================
  Files          23       23           
  Lines        1272     1272           
  Branches      312      312           
=======================================
  Hits         1176     1176           
  Misses         55       55           
  Partials       41       41           

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