fix: Addresses breaking change from library class-transformer (#835)

Co-authored-by: Philip Korsholm <philip.korsholm@hotmail.com>

integration-tests/api/__tests__/store/__snapshots__/swaps.js.snap

@@ -287,7 +287,7 @@ Object {
       "created_at": Any<String>,
       "currency_code": "usd",
       "customer_id": "test-customer",
-      "display_id": 6,
+      "display_id": Any<Number>,
       "draft_order_id": null,
       "email": "test@email.com",
       "fulfillment_status": "fulfilled",

integration-tests/api/__tests__/store/swaps.js

@@ -212,6 +212,7 @@ describe("/store/carts", () => {
           ],
           order: {
             id: "test-order",
+            display_id: expect.any(Number),
             created_at: expect.any(String),
             updated_at: expect.any(String),
           },