Test on zfpy again

[dstansby]

This should have gone with #671, but I forgot. This enables testing with zfpy on all the tests, now zfpy supports numpy 2.0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.92%. Comparing base (6c0ea0f) to head (a04886a).
Report is 30 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #678   +/-   ##
=======================================
  Coverage   99.92%   99.92%           
=======================================
  Files          62       62           
  Lines        2752     2752           
=======================================
  Hits         2750     2750           
  Misses          2        2           

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