fix: remove cache for get_courses

This fixes an issue in small installations where if the permissions were granted after the user login to superset, superset will cache forever the missing permissions and the server needs to be restarted

Author: Ian2012

tutoraspects/templates/aspects/apps/superset/pythonpath/openedx_sso_security_manager.py

@@ -190,7 +190,6 @@ def extra_get_user_roles(self, username, decoded_access_token):
         {{patch("superset-sso-assignment-rules") | indent(8)}}
         return None
 
-    @lru_cache(maxsize=LRU_CACHE_MAX_SIZE)
     def get_courses(self, username, permission="staff", next_url=None):
         """
         Returns the list of courses the current user has access to.