Update CI to test Python 3.12

[djhoese]

As discussed in the monthly meeting. I chose to drop Python 3.10 tests so we still limit how many version we're testing.

• Closes #xxxx
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[djhoese]

Looks like it needs Python 3.12 wheel for pyresample.

Nevermind, needs it in conda-forge.

[djhoese]

Looks like we're waiting on numba and that's waiting on llvmlite. The related PR for that says they're waiting for their November release which should include support for Python 3.12.

[cclauss]

https://pypi.org/project/llvmlite/ supports Py3.12
https://pypi.org/project/numba/ supports Py3.12

[djhoese]

Oh trust me, I've been tracking all of that. I suppose theoretically I can probably just restart these CI jobs and see what happens. Oh I'll need to rebase with main...

[djhoese]

Looks like the conda-forge package for numba didn't have Python 3.12 builds enabled during the last PR merge. That is being fixed here: conda-forge/numba-feedstock#133

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fa4e426) 95.40% compared to head (4877082) 95.88%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2597      +/-   ##
==========================================
+ Coverage   95.40%   95.88%   +0.48%     
==========================================
  Files         371      371              
  Lines       52825    52825              
==========================================
+ Hits        50399    50653     +254     
+ Misses       2426     2172     -254     

Flag	Coverage Δ
behaviourtests	4.15% <ø> (ø)
unittests	95.98% <ø> (-0.04%)	⬇️

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[coveralls]

Pull Request Test Coverage Report for Build 7769033141

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.968%

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Totals
Change from base Build 7758952336:	0.0%
Covered Lines:	50525
Relevant Lines:	52648

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💛 - Coveralls

[djhoese]

As mentioned in the monthly meeting we are fine merging this, but we've also passed the moment that Python 3.9 doesn't need to be supported according to:

https://scientific-python.org/specs/spec-0000/

I will make another PR today to drop Python 3.9 and others can comment there if they disagree with this.