Only support the latest Mypy version

[Viicos]

Fixes #11604. Using the pytest plugin might be done at some point but not really required.

Simplify test code, update support policy, update CI. Bump mypy to 1.15.
Require uv>=0.7.2, as the lockfile format was updated.

Change Summary

Related issue number

Checklist

• The pull request title is a good summary of the changes - it will be used in the changelog
• Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

[hyperlint-ai]

PR Change Summary

Updated support policy to only support the latest Mypy version and simplified test code.

• Bumped Mypy version to 1.15 and updated support policy to only test against the latest version.
• Simplified test code and updated CI configurations.
• Changed command from 'make test-mypy-update-all' to 'make test-mypy-update' in the documentation.

Modified Files

• docs/integrations/mypy.md
• tests/mypy/README.md

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[cloudflare-workers-and-pages]

Deploying pydantic-docs with    Cloudflare Pages

Latest commit:	5378069
Status:	✅  Deploy successful!
Preview URL:	https://b474c9b5.pydantic-docs.pages.dev
Branch Preview URL:	https://mypy-last-version.pydantic-docs.pages.dev

View logs

[Viicos]

cc @DanielNoord

[codspeed-hq]

CodSpeed Performance Report

Merging #11832 will not alter performance

_{Comparing mypy-last-version (5378069) with main (b0d701f)}

Summary

✅ 46 untouched benchmarks

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.