Add Python 3.12 and 3.13 compatibility.

[freakboy3742]

Update the project to use PEP621, and add compatibility for Python 3.12 and 3.13.

Fixes #76.

PR Checklist:

• [x] All new features have been tested
• [x] All new features have been documented
• [x] I have read the CONTRIBUTING.md file
• [x] I will abide by the code of conduct