Build against Numpy 2.0.0rc1 or later

[astrofrog]

We need to release new wheels of reproject compiled against Numpy 2.0.0rc1 ahead of the final Numpy 2.0.0 release, so this PR updates the build-time dependencies and also simplifies the nightly wheels configuration.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.27%. Comparing base (963e523) to head (001a349).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #214   +/-   ##
=======================================
  Coverage   88.27%   88.27%           
=======================================
  Files           6        6           
  Lines         503      503           
=======================================
  Hits          444      444           
  Misses         59       59           

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[astrofrog]

@neutrinoceros - there is a CI failure here related to the copy= argument. Could you take a quick look to see if it's a change that needs to be made here or an issue with astropy?

[astrofrog]

The CI should be fixed in #215 hopefully