Fix for #448 and migration to scipy 1.14

[brownbaerchen]

Python 3.8 is not compatible with scipy 1.14 at this point, so we had to remove it from the tests.

Closes #448

[pancetta]

How are we doing in terms of 3.12?

[brownbaerchen]

How do you mean? On my fork all tests pass with python > 3.8.

[pancetta]

Do we explicitly test with 3.12?

[brownbaerchen]

Yes, we test with 3.9, 3.10, 3.11 and 3.12. I am also developing on 3.12 locally.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.83%. Comparing base (18989d3) to head (9c9b7d7).
Report is 29 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #449      +/-   ##
==========================================
+ Coverage   77.38%   77.83%   +0.44%     
==========================================
  Files         327      332       +5     
  Lines       26085    25843     -242     
==========================================
- Hits        20187    20115      -72     
+ Misses       5898     5728     -170     

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