fix updateAssignments

Description

Description of the MR

Merge Request Checklists

• I have already covered the unit testing
• Logical data model has been updated
• Deployment documentation has been updated

Optional Additional notes

src/main/java/eu/europa/ec/simpl/usersroles/services/impl/IdentityAttributeServiceImpl.java

@@ -81,6 +81,7 @@ public class IdentityAttributeServiceImpl implements IdentityAttributeService {
     }
 
     @Override
+    @Transactional
     public void updateAssignments(List<String> idaCodes) {
         idaRolesRepository.updateAssignments(idaCodes);
     }