⬆ Bump pydantic-ai from 1.83.0 to 1.84.0

Bumps [pydantic-ai](https://github.com/pydantic/pydantic-ai) from 1.83.0 to 1.84.0.
- [Release notes](https://github.com/pydantic/pydantic-ai/releases)
- [Changelog](https://github.com/pydantic/pydantic-ai/blob/main/docs/changelog.md)
- [Commits](pydantic/pydantic-ai@v1.83.0...v1.84.0)

---
updated-dependencies:
- dependency-name: pydantic-ai
  dependency-version: 1.78.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]