Adding python 3.13 as a supported version

[jacobcook1995]

Description

This PR adds python 3.13 as a supported version so that if people install the most recent version of python they can actually download the package without having to roll back.

This PR would mean that we now support 4 versions of python, which I guess isn't really a problem. As far as I recall we discussed whether there were any syntax advantages to upgrading to 3.11 as a minimum version and we didn't think that there were. 3.10 also has about a year and a half of official support left, so there's no pressing need to drop it.

Fixes #722

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works
• Relevant documentation reviewed and updated

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.70%. Comparing base (a47852b) to head (00e93fe).
⚠️ Report is 2693 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #725   +/-   ##
========================================
  Coverage    94.70%   94.70%           
========================================
  Files           73       73           
  Lines         4946     4946           
========================================
  Hits          4684     4684           
  Misses         262      262           

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[davidorme]

LGTM