Add Python 3.12

[hugovk]

Python 3.12 was released on Monday, 2023-10-02

• Python 3.12.0 (final) is here - Core Development - Discussions on Python.org

Please could you add support for 3.12?

PS It took:

• 28 days for 3.11 (Please add image for Python 3.11)
• 106 days for 3.10 (Add Python 3.10)
• 20 days for 3.9 (Python 3.9.0 build)
• 21 hours for 3.8 (Add Python 3.8 support)

[hugovk]

Judging by this 23 Oct 2023 build of travis-ci/cpython-builder:

• Travis CI - Test and Deploy with Confidence

Python 3.12 is now available as 3.12 for at least:

• AMD64: 22.04 Jammy Jellyfish
• AMD64: 20.04 Focal Fossa
• Arm64: 22.04 Jammy Jellyfish