Add Python 3.12 support and remove 3.7 support

[discdiver]

Updates test coverage to Python 3.12 and removes references to supporting Python 3.7.

Closes #404

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• References any related issue by including "Closes #" or "Closes ".
  • If no issue exists and your change is not a small fix, please create an issue first.
• Includes tests or only affects documentation.
• Passes pre-commit checks.
  • Run pre-commit install && pre-commit run --all locally for formatting and linting.
• Includes screenshots of documentation updates.
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[desertaxle]

Thanks @discdiver! Looks like there are a couple of tests that need to be fixed for 3.12. I'll push fixes to this branch and merge once the tests pass.