fix running towncrier

[jlaehne]

pin towncrier<24 until sphinxcontrib-towncrier supports newer versions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.66%. Comparing base (0cbee46) to head (4fdf294).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
- Coverage   86.70%   86.66%   -0.05%     
==========================================
  Files           7        7              
  Lines         331      330       -1     
  Branches       74       72       -2     
==========================================
- Hits          287      286       -1     
  Misses         26       26              
  Partials       18       18              

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