chore(ci): Add Python 3.12

[FraBle]

Addresses codecov/engineering-team#874

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[FraBle]

Looks like this is blocked until pony adopts Python 3.12 support: ponyorm/pony#694
Related discussion in mutmut: boxed/mutmut#295 (comment)

[trent-codecov]

Thanks for the great work here @FraBle!

@giovanni-guidini / @scott-codecov can you evaluate our usage of mutmut here and see if its worth blocking this PR. I'm not sure what value we are getting out of it. As far as I know we aren't using pony in our app and that project doesn't look particularly active.

[trent-codecov]

@FraBle can you just leave mutations on 3.11. We can upgrade that to 3.12 once the underlying library supports it. That should let us get this over the finish line.

[FraBle]

@trent-codecov Do we expect ATS to work fine with Python 3.12? I set it to 3.12 here, but it gets skipped for forks.

[giovanni-guidini]

@trent-codecov Do we expect ATS to work fine with Python 3.12? I set it to 3.12 here, but it gets skipped for forks.

Hopefully, yes. Under the hood it uses the installed pytest version. As long as we can run tests, it should work. But changing ATS is much easier, since it's our tool :P.