Adapt satpy to numpy 2

[mraspaud]

This PR should fix satpy for numpy 2, at least for the parts we have control over.
See also storpipfugl/pykdtree#97
and skyfielders/python-skyfield#898

[codecov]

Codecov Report

Merging #2579 (700ac96) into main (cefe7f8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2579   +/-   ##
=======================================
  Coverage   94.92%   94.92%           
=======================================
  Files         352      352           
  Lines       51285    51285           
=======================================
  Hits        48684    48684           
  Misses       2601     2601           

Flag	Coverage Δ
behaviourtests	4.28% <0.00%> (ø)
unittests	95.54% <100.00%> (ø)

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

Files	Coverage Δ
satpy/readers/aapp_mhs_amsub_l1c.py	95.94% <100.00%> (ø)
satpy/readers/hdf4_utils.py	96.49% <100.00%> (ø)
satpy/readers/utils.py	92.95% <ø> (ø)
satpy/tests/reader_tests/test_utils.py	100.00% <100.00%> (ø)
satpy/tests/writer_tests/test_cf.py	95.53% <ø> (ø)
satpy/writers/cf_writer.py	94.89% <100.00%> (ø)

[coveralls]

Pull Request Test Coverage Report for Build 6469981287

• 9 of 9 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.498%

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Totals
Change from base Build 6469397126:	0.0%
Covered Lines:	48807
Relevant Lines:	51108

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💛 - Coveralls

[djhoese]

Should we merge this and then just wait for skyfield to fix things? Or add an xfail for skyfield-based tests?

[mraspaud]

The issue seems to be standing still since a couple of weeks, so I'm not too optimistic...maybe xfail is a good idea

[djhoese]

As discussed in general on slack a week or so ago, with NEP 29 we could justify dropping (setting a lower limit) to numpy 1.20. I'd say this is a good PR to include that in. Thoughts?

[mraspaud]

On it

[mraspaud]

@djhoese fixed