Update required Python version to 3.12

[alexdewar]

Update pyproject.toml and regenerate poetry.lock file. Also update CI workflows to use Python 3.12.

I meant to test this in the lab, but didn't have enough time in the end. I'd be really surprised if it broke anything though (the tests pass and the GUI works fine with dummy devices), so I think we should just do it. I'll test it when I next go into the lab (hopefully next week) and we can always revert.

Closes #584.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.97%. Comparing base (17c35fb) to head (dda027f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #694   +/-   ##
=======================================
  Coverage   84.97%   84.97%           
=======================================
  Files          69       69           
  Lines        3461     3461           
=======================================
  Hits         2941     2941           
  Misses        520      520           

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[dalonsoa]

There're are some things failing with links - presumably because of the removal of Codacy - and the tests are not running. It looks good, but I'll wait to approve until that is sorted.

[dalonsoa]

Actually, tests are passing, but those are not the ones that are required. The settings need updating. As it turns out, I do not have Admin access. Have you, @alexdewar ?

[alexdewar]

Thanks @dalonsoa. Yep, I'm an admin -- I've updated the rules. I've upgraded the team's permissions to admin too.