fix: 카카오톡 bulk send 오류 fix

mens-api/src/main/java/kr/xit/ens/kakao/v2/service/KkotalkEltrcDocService.java

@@ -239,7 +239,7 @@ public class KkotalkEltrcDocService extends AbstractService implements
         }
         String param = "{\"envelopes\":" + JsonUtils.toJson(envelopes) + "}";
         return webClient.exchangeKkotalk(
-            HOST + API_SEND[0].replace("{PRODUCT_CODE}", reqDTO.getProductCode()),
+            HOST + API_BULKSEND[0].replace("{PRODUCT_CODE}", reqDTO.getProductCode()),
             HttpMethod.valueOf(API_BULKSEND[1]),
             param,
             KkotalkDTO.BulkSendResponse.class,