BUG: changing int comparison to fix incompatibility with astropy 6.1

[bsipocz]

Hopefully this fixes #3006 and the CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.35%. Comparing base (886817e) to head (462c2da).
Report is 98 commits behind head on main.

❗ Current head 462c2da differs from pull request most recent head b85a49e. Consider uploading reports for the commit b85a49e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3008      +/-   ##
==========================================
+ Coverage   66.83%   67.35%   +0.52%     
==========================================
  Files         237      236       -1     
  Lines       18327    18320       -7     
==========================================
+ Hits        12248    12339      +91     
+ Misses       6079     5981      -98     

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