Python dependency: Update authlib requirement in /web/regression

Updates the requirements on [authlib](https://github.com/lepture/authlib) to permit the latest version.
- [Release notes](https://github.com/lepture/authlib/releases)
- [Changelog](https://github.com/lepture/authlib/blob/master/docs/changelog.rst)
- [Commits](lepture/authlib@v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: authlib
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -38,7 +38,7 @@ ldap3==2.*
 gssapi==1.9.*
 user-agents==2.2.0
 pywinpty==2.0.*; sys_platform=="win32"
-Authlib==1.3.*
+Authlib==1.4.*
 pyotp==2.*
 qrcode==7.*; python_version <= '3.8'
 qrcode[pil]==8.*; python_version >= '3.9'