chore: Upgrade to Python 3.12

[candrews]

Using Python 3.12 as the base for docker images

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Description

Upgrade to Python 3.12

Use Python 3.12 as the base for docker images (upgrading from Python 3.11).

Checklist:

• [X] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [X] I have added tests that prove my feature, policy, or fix is effective and works
• [X] New and existing tests pass locally with my changes