Bump authlib from 1.5.2 to 1.6.1

---
updated-dependencies:
- dependency-name: authlib
  dependency-version: 1.6.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 anyio==4.9.0
-Authlib==1.5.2
+Authlib==1.6.1
 backports.tarfile==1.2.0
 certifi==2025.1.31
 cffi==1.17.1