[Feature Request] Python 3.12 support

[graingert-coef]

Is your feature request related to a problem? Please describe.
Currently CI only tests on 3.9 and 3.

Describe the solution you'd like
I'd like to see ci run against 3.8 and 3.12

Describe alternatives you've considered
n/a

Additional context
n/a

[Adam]

Thank you for submitting this feature request and for the PR, @graingert-coef