fix(core): support pydantic 2.12

[cbornet]

Make core tests work with Pydantic 2.12

[codspeed-hq]

CodSpeed Performance Report

Merging #33422 will not alter performance

_{Comparing cbornet:core-pydantic-2.12 (120693f) with master (41fe18b)¹}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched
⏩ 21 skipped²

Footnotes

1. No successful run was found on master (9140a7c) during the generation of this report, so 41fe18b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

2. 21 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[cbornet]

Probably need something like what was done in #30554 to pass the tests.

[cbornet]

And most likely related to https://pydantic.dev/articles/pydantic-v2-12-release#pep-728-support--typeddict-with-typed-extra-items

[cbornet]

It seems Codspeed fails for deepseek and fireworks independently of this PR.

[cbornet]

Closing in favor of #33461 and #33477