Static test case fix

Author: Mohamed-Asar

app/code/Magento/CatalogInventory/Test/Unit/Model/Product/QuantityValidatorTest.php

@@ -1,4 +1,8 @@
 <?php
+/**
+ * Copyright 2025 Adobe
+ * All Rights Reserved.
+ */
 declare(strict_types=1);
 
 namespace Magento\CatalogInventory\Test\Unit\Model\Product;