Support python 3.12 in test suite runner

[randomPoison]

The Generator class takes 3 type arguments, but in python 3.13 it became possible to just specify the first one and the other 2 would default to None. Explicitly adding the None arguments allows this to also work on python 3.12.

One of my work machines is on a version of Ubuntu that has 3.12 installed and it looks like it'd be mildly painful to install 3.13. Seems like it'd be reasonable to support 3.12 here, unless there's some reason that'd be a bad idea.

[kkysen]

Hmm, I guess this is fine, just annoying/ugly. I'd personally rather just upgrade Python (which is quite easy with uv), but this is okay, too, if that's preferable to others.

[randomPoison]

Yeah I agree it's uglier. Is the test suite setup with uv? idk how any of that works, but if it's easy enough to setup a venv or whatever with uv where I can locally setup 3.13 then I can also try that.

[thedataking]

I bumped us down to Python 3.12 over here immunant/c2rust-testsuite@593f753 after we discussed it on Slack.

Please land with 3.12 support as Khyber approved rather spending more time on this matter.

[kkysen]

Is the test suite setup with uv?

Yes.

if it's easy enough to setup a venv or whatever with uv where I can locally setup 3.13 then I can also try that.

If you increase the version in project.toml, go to that directory it's in, rm -rf .venv/, and uv python install, I think it should do it automatically. Might need an extra uv sync as well.