chore(deps): bump authlib

Bumps the uv-security-updates group with 1 update in the / directory: [authlib](https://github.com/authlib/authlib).


Updates `authlib` from 1.6.7 to 1.6.9
- [Release notes](https://github.com/authlib/authlib/releases)
- [Changelog](https://github.com/authlib/authlib/blob/main/docs/changelog.rst)
- [Commits](authlib/authlib@v1.6.7...v1.6.9)

---
updated-dependencies:
- dependency-name: authlib
  dependency-version: 1.6.9
  dependency-type: direct:production
  dependency-group: uv-security-updates
...

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Author: dependabot[bot]