refactor: update method parameter type hints in product model

This commit refines the type hints in the Product model. Specifically, the
getUrlRewrittenWithHost() method's $Project parameter type is defined more explicitly, indicating
that it can accept either a type of QUI\\Projects\\Project or null.

Related: quiqqer/package-feed#15

src/QUI/ERP/Products/Product/Model.php

@@ -717,11 +717,11 @@ public function getUrl(QUI\Projects\Project $Project = null): string
     }
 
     /**
-     * @param null $Project
+     * @param QUI\Projects\Project|null $Project
      * @return string
      * @throws QUI\Exception
      */
-    public function getUrlRewrittenWithHost($Project = null): string
+    public function getUrlRewrittenWithHost(?QUI\Projects\Project $Project = null): string
     {
         if (!$Project) {
             $Project = QUI::getRewrite()->getProject();