[MODIFY] Update `@Transactional` annotation in `DataGroupService#update` to explicitly set `readOnly` to false

src/main/java/kr/re/etri/autoflow/service/DataGroupService.java

@@ -105,7 +105,7 @@ public class DataGroupService {
         return dataGroupRepository.save(project);
     }
 
-    @Transactional
+    @Transactional(readOnly = false)
     public Optional<DataGroupEntity> update(Long id, ProjectRequest dto) {
         return dataGroupRepository.findById(id)
                 .map(project -> {