Removed dicts from the serialization

Author: kishore7snehil

auth0/authentication/back_channel_login.py

@@ -49,7 +49,7 @@ def back_channel_login(
         if authorization_details is not None:
             if isinstance(authorization_details, str):
                 data["authorization_details"] = authorization_details
-            elif isinstance(authorization_details, (list, dict)):
+            elif isinstance(authorization_details, (list)):
                 data["authorization_details"] = json.dumps(authorization_details)
 
         data.update(kwargs)