Cleanup Radau again

[JonasBreuling]

No description provided.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 80.48780% with 16 lines in your changes missing coverage. Please review.

Project coverage is 81.21%. Comparing base (0716efc) to head (6926ed6).
Report is 1 commits behind head on main.

Files	Patch %	Lines
scipy_dae/integrate/_dae/radau.py	78.57%	12 Missing ⚠️
.../integrate/_dae/tests/test_integration_rational.py	71.42%	2 Missing ⚠️
...integrate/_dae/tests/test_integration_robertson.py	89.47%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
- Coverage   81.29%   81.21%   -0.09%     
==========================================
  Files          17       17              
  Lines        1508     1517       +9     
==========================================
+ Hits         1226     1232       +6     
- Misses        282      285       +3     

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