fix: DTO fix

mens-core/src/main/java/kr/xit/biz/ens/model/kakao/v2/KkotalkDocDTO.java

@@ -44,7 +44,8 @@ public class KkotalkDocDTO {
     @AllArgsConstructor
     @SuperBuilder
     @JsonInclude(JsonInclude.Include.NON_EMPTY)
-    public static class Envelope implements IApiResponse {
+    //public static class Envelope implements IApiResponse {
+    public static class Envelope {
         /**
          * 발송할 문서의 제목 : 필수 - max 40자
          */