PHPCPD blaclist updated with Elasticsearch6

Author: ishakhsuvarov

dev/tests/static/testsuite/Magento/Test/Php/_files/phpcpd/blacklist/common.txt

@@ -208,4 +208,4 @@ Magento/InventoryGroupedProductIndexer/Indexer
 Magento/Customer/Model/FileUploaderDataResolver.php
 Magento/Customer/Model/Customer/DataProvider.php
 Magento/InventoryShippingAdminUi/Ui/DataProvider
-Magento\Elasticsearch6\Model\Client\Elasticsearch
+Magento/Elasticsearch6/Model/Client/Elasticsearch