Merge pull request #89 from Donut-DONationUTile/feature/fcm

fix: 역직렬화 오류 문제 해결

src/main/java/zero/eight/donut/dto/fcm/FcmTokenRequestDto.java

@@ -1,10 +1,8 @@
 package zero.eight.donut.dto.fcm;
 
 import lombok.Getter;
-import lombok.RequiredArgsConstructor;
 
-@RequiredArgsConstructor
 @Getter
 public class FcmTokenRequestDto {
-    private final String token;
+    private String token;
 }