CI: Run against Numpy 2.0 nightlies

[WardBrian]

Submission Checklist

• [x] Run unit tests
• [x] Declare copyright holder and open-source license: see below

Summary

Numpy is planning a version 2.0 in December: https://github.com/numpy/numpy/issues/24300

This PR is not intended to be merged, but just exists so we can flag any issues against their nightly builds before this release.

Copyright and Licensing

Please list the copyright holder for the work you are submitting (this will be you or your assignee, such as a university or company):

Simons Foundation

By submitting this pull request, the copyright holder is agreeing to license the submitted work under the following licenses:

• Code: BSD 3-clause (https://opensource.org/licenses/BSD-3-Clause)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.90%. Comparing base (cbea79f) to head (c2b115b).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #711   +/-   ##
========================================
  Coverage    79.90%   79.90%           
========================================
  Files           75       75           
  Lines        11529    11529           
========================================
  Hits          9212     9212           
  Misses        2317     2317           

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