AC-5986::Unable to update cart item custom option values with REST API-Fixed Static test failure

Author: mahesh-singh-rajawat

dev/tests/api-functional/testsuite/Magento/Quote/Api/GuestCartAddingItemsTest.php

@@ -28,6 +28,11 @@ class GuestCartAddingItemsTest extends WebapiAbstract
      * @var \Magento\TestFramework\ObjectManager
      */
     protected $objectManager;
+    
+    /**
+     * @var ProductResource|mixed
+     */
+    private mixed $productResource;
 
     protected function setUp(): void
     {