bump pyo3 to 0.26, jiter to 0.11

[davidhewitt]

Change Summary

Bump pyo3 to 0.26. Deprecations are handled commit-by-commit.

Related issue number

N/A

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

[codspeed-hq]

CodSpeed Performance Report

Merging #1785 will improve performances by 18.54%

_{Comparing dh/bump-pyo3-0.26 (273171a) with main (313d199)}

Summary

⚡ 1 improvement
✅ 158 untouched

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_field_function_validator	403.6 µs	340.5 µs	+18.54%