N°8017 - Security - dependabot - Symfony's VarDumper vulnerable to un… (#731)

Upgrade all Symfony components to last security fix (~6.4.0)

lib/symfony/twig-bridge/NodeVisitor/Scope.php

@@ -20,7 +20,7 @@ class Scope
     private array $data = [];
     private bool $left = false;
 
-    public function __construct(self $parent = null)
+    public function __construct(?self $parent = null)
     {
         $this->parent = $parent;
     }