Add Python3.12 support

[teubert]

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[github-actions]

Thank you for opening this PR. Each PR into dev requires a code review. For the code review, look at the following:

• Reviewer (someone other than author) should look for bugs, efficiency, readability, testing, and coverage in examples (if relevant).
• Ensure that each PR adding a new feature should include a test verifying that feature.
• All errors from static analysis must be resolved.
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• Any added dependencies are included in requirements.txt, setup.py, and dev_guide.rst (this document)
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