Address lint warnings and drop Python 3.8

[yarikoptic]

In

• Log when file timestamp unexpectedly in the future + more information in the failing test_memoize_path_dir #98

apparently only benchmarks were executed for some reason. May be because test workflow was entirely disabled due to inactivity. Activated now, we should bring it back to green.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.06%. Comparing base (453d377) to head (770170d).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #99   +/-   ##
=======================================
  Coverage   92.06%   92.06%           
=======================================
  Files           4        4           
  Lines         529      529           
  Branches       42       40    -2     
=======================================
  Hits          487      487           
  Misses         25       25           
  Partials       17       17           

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