N°6934 - Symfony 6.4 - upgrade Symfony bundles to 6.4 (#580)

* Update Symfony lib to version ~6.4.0
* Update code missing return type
* Add an iTop general configuration entry to store application secret (Symfony mandatory parameter)
* Use dependency injection in ExceptionListener & UserProvider classes

lib/symfony/css-selector/Node/PseudoNode.php

@@ -23,8 +23,8 @@ namespace Symfony\Component\CssSelector\Node;
  */
 class PseudoNode extends AbstractNode
 {
-    private $selector;
-    private $identifier;
+    private NodeInterface $selector;
+    private string $identifier;
 
     public function __construct(NodeInterface $selector, string $identifier)
     {
@@ -42,9 +42,6 @@ class PseudoNode extends AbstractNode
         return $this->identifier;
     }
 
-    /**
-     * {@inheritdoc}
-     */
     public function getSpecificity(): Specificity
     {
         return $this->selector->getSpecificity()->plus(new Specificity(0, 1, 0));