Use PEP570 syntax

[Viicos]

Only the non deprecated stuff was touched, and last commit is a small fix that removes the need for a type ignore

[codspeed-hq]

CodSpeed Performance Report

Merging #8940 will not alter performance

_{Comparing Viicos:pep570 (131b3c2) with main (acf684a)}

Summary

✅ 10 untouched benchmarks

[sydney-runkle]

Looks great! Left one comment about a variable that I think we should probably rename.

Thanks for your awesome work on this!!

[sydney-runkle]

I think relnotes-change is a bit of a strong label here, but I don't think relnotes-fix makes sense...

[sydney-runkle]

@Viicos,

If you're interested in contributing to pydantic-core at all, we could stand to use PEP570 syntax over there as well!

[Viicos]

Yes I was thinking about doing the same there, will land a PR in a couple hours

[Viicos]

@sydney-runkle: pydantic/pydantic-core#1216