Run tests on Python 3.11

[sk1p]

Fixes #54

Contributor Checklist:

• [ ] I have added myself to the creators.json file
• [ ] I have added a changelog entry for my contribution
• [ ] I have added/updated documentation for all user-facing changes
• [ ] I have added/updated test cases

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4b1e088) 77.23% compared to head (6ea3ac9) 77.23%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #74 +/- ## ======================================= Coverage 77.23% 77.23% ======================================= Files 8 8 Lines 549 549 Branches 66 84 +18 ======================================= Hits 424 424 Misses 110 110 Partials 15 15 ```

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