Bump minimum Python to 3.10

[Tobias-Fischer]

With python 3.9, one gets: TypeError: unsupported operand type(s) for |: 'type' and 'type'

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 35.54%. Comparing base (1341d24) to head (cad8cda). Report is 57 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage   31.80%   35.54%   +3.74%     
==========================================
  Files          35       38       +3     
  Lines        7610     7850     +240     
==========================================
+ Hits         2420     2790     +370     
+ Misses       5190     5060     -130     

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