Apply __futre__.annotations to skbuild_model

[LecrisUT]

This thing is getting in the way a lot

Edit: Yeah, had a hunch it would blow up in various places, but there are more issues than I would have expected

[henryiii]

We probably can't do this until we depend on something like 3.10+. At that point we could even drop the future import. Generally, the future import means you aren't using the types at runtime, but we are for this module.

[LecrisUT]

Generally, the future import means you aren't using the types at runtime, but we are for this module.

I thought dataclasses are still safe for that.

But any clue on why 3.12 and such are failing?

[henryiii]

We are processing the type annotations. Pretty much most of this file is for type annotation processing: https://github.com/scikit-build/scikit-build-core/blob/main/src/scikit_build_core/settings/sources.py

I'm guessing those are failing because it's not rendering one of the strings somewhere (in the above linked file). I think we should do that, so likely there's something missing. It might be that you'd need annotationlib (3.14+, backport in typing_extensions), though.