Add missing import func

Author: thomas-kl1

Setup/Patch/Data/PopulateCategoryCodeV1.php

@@ -15,6 +15,7 @@
 use Magento\Framework\Phrase;
 use Magento\Framework\Setup\Patch\DataPatchInterface;
 
+use function implode;
 use function str_replace;
 use function strtolower;