[RBAC] Update related name to reflect upstream DAB change (ansible#15093

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Update related name to reflect upstream DAB change

awx/api/generics.py

@@ -814,7 +814,7 @@ def get_queryset(self):
             qs = User.objects.filter(has_roles__in=ancestors) | User.objects.filter(is_superuser=True)
             auditor_role = RoleDefinition.objects.filter(name="System Auditor").first()
             if auditor_role:
-                qs |= User.objects.filter(roleuserassignment__role_definition=auditor_role)
+                qs |= User.objects.filter(role_assignments__role_definition=auditor_role)
             return qs.distinct()
 
         roles = set(Role.objects.filter(content_type=content_type, object_id=obj.id))