Drop python 3.8

[tristanlatr]

Fixes #849

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.63%. Comparing base (f63d816) to head (beaf6d8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #850      +/-   ##
==========================================
+ Coverage   92.35%   92.63%   +0.28%     
==========================================
  Files          47       47              
  Lines        8555     8489      -66     
  Branches     1704     1557     -147     
==========================================
- Hits         7901     7864      -37     
+ Misses        382      358      -24     
+ Partials      272      267       -5     

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[github-actions]

According to pydoctor_primer, this change doesn't affect pydoctor warnings on a corpus of open source code. ✅