Style updates

https://github.com/firegento/FireGento_FastSimpleImport2/pull/121/files/89aa66e7bacef86511b148297ee1cae833cea457#r1002145549

Author: rbrown

Model/Import/Category.php

@@ -41,6 +41,7 @@
 use Magento\Framework\Filesystem;
 use Magento\UrlRewrite\Model\UrlPersistInterface;
 use Magento\Catalog\Api\CategoryRepositoryInterface;
+use Magento\Eav\Model\Entity\Attribute\Source\Boolean;
 
 /**
  * Entity Adapter for importing Magento Categories
@@ -339,7 +340,7 @@ public function getAttributeOptions(AbstractAttribute $attribute): array
             $index = 'label';
             if (
                 in_array($attribute->getAttributeCode(), $this->indexValueAttributes) ||
-                $attribute->getSourceModel() == "Magento\Eav\Model\Entity\Attribute\Source\Boolean"
+                $attribute->getSourceModel() == Boolean::class
             ) {
                 $index = 'value';
             };