fix(uuid): validation from string

[JeanArhancet]

Change Summary

Fix UUID4 validation from string

Related issue number

fix #1164

Checklist

• Unit tests for the changes exist
• Documentation reflects the changes where applicable
• Pydantic tests pass with this pydantic-core (except for expected changes)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

Selected Reviewer: @dmontagu

[codspeed-hq]

CodSpeed Performance Report

Merging #1172 will improve performances by 22.96%

_{Comparing JeanArhancet:fix/uuid4-validation-from-string (19d4b7e) with main (8be45e6)}

Summary

⚡ 2 improvements
✅ 144 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	JeanArhancet:fix/uuid4-validation-from-string	Change
⚡	test_core_str	38.8 µs	31.7 µs	+22.67%
⚡	test_core_future_str	39.5 µs	32.1 µs	+22.96%

[JeanArhancet]

please review

[davidhewitt]

Thanks, this looks correct to me 👍