Build against numpy 2.0rc1

[djhoese]

• Closes #xxxx (remove if there is no corresponding issue, which should only be the case for minor changes)
• Tests added (for all bug fixes or enhancements)
• Tests passed (for all non-documentation changes)
• Passes git diff origin/master **/*py | flake8 --diff (remove if you did not edit any Python files)
• Fully documented (remove if this change should not be visible to users, e.g., if it is an internal clean-up, or if this is part of a larger project that will be documented later)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.84%. Comparing base (2d126fc) to head (c77b830).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
+ Coverage   91.63%   91.84%   +0.20%     
==========================================
  Files          12       12              
  Lines        4043     4033      -10     
==========================================
- Hits         3705     3704       -1     
+ Misses        338      329       -9     

Flag	Coverage Δ
unittests	91.84% <ø> (+0.20%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[coveralls]

coverage: 91.867%. remained the same
when pulling c77b830 on djhoese:build-np2rc1
into b137ced on pytroll:main.

[djhoese]

Ok so the remaining unstable failures all seem to be caused by xarray incompatibility with numpy 2. See pydata/xarray#8402. With the changes mentioned in that PR things seem to pass except for another numpy import in xarray causing a deprecation warning. So theoretically fixes in xarray should fix this just fine. I'm going to merge and release this as is.