Python 3.12 testing

[dstansby]

No description provided.

[codecov]

Codecov Report

Merging #403 (ae077d5) into main (7e1dc81) will not change coverage.
The diff coverage is n/a.

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##             main     #403   +/-   ##
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  Coverage   93.60%   93.60%           
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  Files          25       25           
  Lines         891      891           
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  Hits          834      834           
  Misses         57       57           

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[dstansby]

Ha, so it turns out the issue isn't building the local copy of reproject, but the testing dep sunpy[map] pulling in a dependency on reproject, and trying to download and build the latest released verision from PyPI, which doesn't compile under Python 3.12...

[dstansby]

So I think the best way round this is to not test with sunpy on Python 3.12, until a release of reproject has been done with Python 3.12 to PyPI. I can't see another good way to avoid the sunpy test dependency trying to pull in a version of reproject from PyPI that is incompatible with Python 3.12.

[astrofrog]

Looks good, thanks!