fix: cython 3 compat

[bdraco]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (4187052) 95.20% compared to head (410012d) 95.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   95.20%   95.23%   +0.03%     
==========================================
  Files           1        1              
  Lines         146      147       +1     
  Branches       16       16              
==========================================
+ Hits          139      140       +1     
  Misses          4        4              
  Partials        3        3              

Impacted Files	Coverage Δ
src/chacha20poly1305_reuseable/__init__.py	95.23% <100.00%> (+0.03%)	⬆️

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