[HOTFIX] 아이템 관련 스키마 변경에 따른 로직 수정

추후 확인 후 수정 요망

src/main/java/com/noplanb/domain/quest/application/QuestService.java

@@ -126,7 +126,7 @@ public ResponseEntity<?> completeQuest(UserPrincipal userPrincipal, Long id) {
 
     private List<Item> unLockItem(Long level, Character character) {
         List<Item> items = character.getItems();
-        List<Item> lockItems = items.stream().filter(item -> item.getRequiredLevel().equals(level))
+        List<Item> lockItems = items.stream().filter(item -> item.getItemImage().getRequiredLevel().equals(level))
                 .collect(Collectors.toList());
         return lockItems;