Fixed coding style.

src/Entity/Contracts/HasMasterAttachmentInterface.php

@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
  *
@@ -20,7 +23,6 @@
 
 namespace App\Entity\Contracts;
 
-
 use App\Entity\Attachments\Attachment;
 
 interface HasMasterAttachmentInterface
@@ -32,4 +34,4 @@ interface HasMasterAttachmentInterface
      * @return Attachment|null the master picture Attachment of this part (if there is one)
      */
     public function getMasterPictureAttachment(): ?Attachment;
-}
+}