Require python >= 3.10

[Tveten]

• Remove support for python 3.9.
• Fixes [MNT] Drop python 3.9 (and 3.10?) support #56

Python 3.10 improves type hinting, and libraries like numpy does not support python 3.9 anymore.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.53%. Comparing base (d19003d) to head (b1b4213).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #57      +/-   ##
==========================================
- Coverage   98.54%   98.53%   -0.02%     
==========================================
  Files          49       49              
  Lines        1858     1838      -20     
==========================================
- Hits         1831     1811      -20     
  Misses         27       27              

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