build: block pydantic2.4.1

[tlambert03]

closes #143

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (e80c0d1) 97.03% compared to head (19874c1) 98.28%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   97.03%   98.28%   +1.25%     
==========================================
  Files          14       14              
  Lines         877      877              
==========================================
+ Hits          851      862      +11     
+ Misses         26       15      -11     

see 2 files with indirect coverage changes

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