Add support for Python 3.12

[hugovk]

Thanks for contributing!

Before submitting your pull request please have a look at the following checklist:

• [x] ran the tests (pytest)
• [x] all style issues addressed (flake8)
• [x] your changes are covered by tests
• [x] your changes are documented, if needed

In addition, please take care to provide a proper description on what your change does, fixes or achieves when submitting the pull request.

The second and final Python 3.12 release candidate is out! :rocket:

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/

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (21f9fd5) 96.95% compared to head (ae32c50) 96.95%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #735 +/- ## ======================================= Coverage 96.95% 96.95% ======================================= Files 20 20 Lines 1545 1545 ======================================= Hits 1498 1498 Misses 47 47 ```

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[andialbrecht]

Thanks a lot!