chore(deps): bump authlib in /python/framework-extensions/pydantic-ai

Bumps [authlib](https://github.com/authlib/authlib) from 1.6.9 to 1.6.12.
- [Release notes](https://github.com/authlib/authlib/releases)
- [Changelog](https://github.com/authlib/authlib/blob/1.6.12/docs/changelog.rst)
- [Commits](authlib/authlib@v1.6.9...1.6.12)

---
updated-dependencies:
- dependency-name: authlib
  dependency-version: 1.6.12
  dependency-type: indirect
...

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Author: dependabot[bot]