Merge pull request #278 from Modagbul/MNG-22

fix : 반복미션 모아보기 인증 인원수 리턴 타입 변경

src/main/java/com/moing/backend/domain/mission/domain/repository/MissionCustomRepositoryImpl.java

@@ -200,7 +200,7 @@ public Optional<List<GatherSingleMissionRes>> findSingleMissionByMemberId(Long m
                                                 .or(missionArchive.mission.type.eq(MissionType.ONCE))
                                 ),
 
-                        mission.team.numOfMember.longValue()
+                        mission.team.numOfMember.stringValue()
                 ))
                 .from(mission)
                 .leftJoin(missionArchive)