flyway 알림 수정 (#644)

chore: flyway 알림 테이블 생성 내 콤마 삭제

backend/baton/src/main/resources/db/migration/V20231007_1__create_table_notification.sql

@@ -9,5 +9,5 @@ CREATE TABLE notification
     member_id         BIGINT            NOT NULL,
     created_at        DATETIME(6)       NOT NULL,
     updated_at        DATETIME(6)       NOT NULL,
-    deleted_at        DATETIME(6),
+    deleted_at        DATETIME(6)
 );