chore(deps): update authlib requirement in /store/backend (#1037)

Updates the requirements on [authlib](https://github.com/authlib/authlib) to permit the latest version.
- [Release notes](https://github.com/authlib/authlib/releases)
- [Changelog](https://github.com/authlib/authlib/blob/main/docs/changelog.rst)
- [Commits](authlib/authlib@v0.15...v1.6.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

store/backend/pyproject.toml

@@ -12,7 +12,7 @@ authors = [
 license = { text = "MIT" }
 dependencies = [
     "auth0-python~=3.16",
-    "authlib~=0.15",
+    "authlib~=1.6",
     "connexion[swagger-ui,uvicorn,flask]==3.0.0",
     "flask~=2.0",
     "flask-caching~=2.0",