Upgrade to version 3.12 of Python

[jsf9k]

🗣 Description

This pull request upgrades GitHub Actions to use the latest minor version of Python.

💭 Motivation and context

The latest version Python is likely more efficient than previous versions.

🧪 Testing

All automated tests pass.

✅ Pre-approval checklist

• [x] This PR has an informative and human-readable title.
• [x] Changes are limited to a single goal - eschew scope creep!
• [x] All relevant type-of-change labels have been added.
• [x] I have read the CONTRIBUTING document.
• [x] These code changes follow cisagov code standards.
• [x] All new and existing tests pass.

[mcdonnnj]

@jsf9k Are you alright with me closing this PR out in favor of #157?

[jsf9k]

@jsf9k Are you alright with me closing this PR out in favor of #157?

OK :cry:

[mcdonnnj]

This pull request has been superseded by #157 but thank you to @jsf9k for giving me the idea for a long-term solution!