Add support for Python 3.12

[hugovk]

The Python 3.12 release candidate is out! 🚀

Call to action

We strongly encourage maintainers of third-party Python projects to prepare their projects for 3.12 compatibilities during this phase, and where necessary publish Python 3.12 wheels on PyPI to be ready for the final release of 3.12.0.

See also https://dev.to/hugovk/help-test-python-312-beta-1508/

Also bump CI to use latest PyPy3.10.

[welcome]

Thanks for submitting your first pull request! You are awesome! 🤗

If you haven't done so already, check out EBP's Code of Conduct and our Contributing Guide, as this will greatly help the review process.

Welcome to the EBP community! 🎉

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (950908b) 92.68% compared to head (e10e009) 91.25%.

❗ Current head e10e009 differs from pull request most recent head 70418f1. Consider uploading reports for the commit 70418f1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #99      +/-   ##
==========================================
- Coverage   92.68%   91.25%   -1.43%     
==========================================
  Files          31       31              
  Lines        1817     1841      +24     
==========================================
- Hits         1684     1680       -4     
- Misses        133      161      +28     

Flag	Coverage Δ
pytests	91.25% <ø> (-1.43%)	⬇️

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[chrisjsewell]

superceded by #109, I would have merged this but you changed more than just adding 3.12 😅