DEP: drop support for Python 3.8 and 3.9, require 3.10 or newer

[neutrinoceros]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 28.64%. Comparing base (3373f93) to head (8456e6f).
⚠️ Report is 72 commits behind head on master.
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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #672       +/-   ##
===========================================
- Coverage   62.28%   28.64%   -33.64%     
===========================================
  Files          11       87       +76     
  Lines         928    16835    +15907     
===========================================
+ Hits          578     4822     +4244     
- Misses        350    12013    +11663     

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[neutrinoceros]

This one is ready to go !
@VaChristiaens @IainHammond

[neutrinoceros]

I'm also dropping 3.9 in the same PR to save time in the merge queue, as it seems acceptable too.
This should now resolve #675