Bump authlib from 1.6.0 to 1.6.6 in /cloud-run-single/1-apps/apps/adk

Bumps [authlib](https://github.com/authlib/authlib) from 1.6.0 to 1.6.6.
- [Release notes](https://github.com/authlib/authlib/releases)
- [Changelog](https://github.com/authlib/authlib/blob/main/docs/changelog.rst)
- [Commits](authlib/authlib@v1.6.0...v1.6.6)

---
updated-dependencies:
- dependency-name: authlib
  dependency-version: 1.6.6
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]