Drop Python 3.8 support (remove typing_extensions from depends)

[yarikoptic]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.58%. Comparing base (7074582) to head (eaa32d2).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #262      +/-   ##
==========================================
- Coverage   97.58%   97.58%   -0.01%     
==========================================
  Files          16       16              
  Lines        1741     1739       -2     
==========================================
- Hits         1699     1697       -2     
  Misses         42       42              

Flag	Coverage Δ
unittests	97.58% <100.00%> (-0.01%)	⬇️

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[yarikoptic]

whatever had to run seems to have ran and is green! there is some odd memory of 3.8 and macos-12 which are no more:

❯ git grep -e macos-12 -e '3\.8' | grep -v CHANG
❯ 

Let's proceed so other PRs could get greener too