fix migrations

Fix #8363

packages/backend/migration/1579282808087-v12-3.js

@@ -1,6 +1,6 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-class v1231579282808087 {
+
+
+export class v1231579282808087 {
     constructor() {
         this.name = 'v1231579282808087';
     }
@@ -11,4 +11,3 @@ class v1231579282808087 {
         await queryRunner.query(`ALTER TABLE "announcement" DROP COLUMN "updatedAt"`, undefined);
     }
 }
-exports.v1231579282808087 = v1231579282808087;