Bump pydantic-settings in /ai/langchain-skills-agent/src

Bumps [pydantic-settings](https://github.com/pydantic/pydantic-settings) from 2.13.1 to 2.14.2.
- [Release notes](https://github.com/pydantic/pydantic-settings/releases)
- [Commits](pydantic/pydantic-settings@v2.13.1...v2.14.2)

---
updated-dependencies:
- dependency-name: pydantic-settings
  dependency-version: 2.14.2
  dependency-type: indirect
...

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Author: dependabot[bot]