Python dependency: Bump authlib from 1.6.6 to 1.6.8 in /web/regression

Bumps [authlib](https://github.com/authlib/authlib) from 1.6.6 to 1.6.8.
- [Release notes](https://github.com/authlib/authlib/releases)
- [Changelog](https://github.com/authlib/authlib/blob/main/docs/changelog.rst)
- [Commits](authlib/authlib@v1.6.6...v1.6.8)

---
updated-dependencies:
- dependency-name: authlib
  dependency-version: 1.6.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -12,7 +12,7 @@
 # relevant packages.
 ###############################################################################
 
-Authlib==1.6.6
+Authlib==1.6.8
 azure-identity==1.25.1
 azure-mgmt-rdbms==10.1.1
 azure-mgmt-resource==24.0.0