Minimum Python support 3.10

[ocefpaf]

Python 3.8 reached EOL and while 3.9 will only reach EOL 2025-10, pyudunits2 is py310 only and we should move away from the compiled udunits2 extension.

@benjwadams let me know what you think. Once this one is merged I'm also planning on activating pyupgrade and ruff format and slowly update the code here.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.17%. Comparing base (5c56994) to head (e322674).
Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
compliance_checker/suite.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1122   +/-   ##
========================================
  Coverage    82.17%   82.17%           
========================================
  Files           25       25           
  Lines         5206     5206           
  Branches      1162     1162           
========================================
  Hits          4278     4278           
  Misses         627      627           
  Partials       301      301           

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[ocefpaf]

@benjwadams I'm planing on merging this one next week. Let me know if you have any concerns/comments.