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/Parser/Token.php

@@ -31,9 +31,9 @@ class Token
     public const TYPE_NUMBER = 'number';
     public const TYPE_STRING = 'string';
 
-    private $type;
-    private $value;
-    private $position;
+    private ?string $type;
+    private ?string $value;
+    private ?int $position;
 
     public function __construct(?string $type, ?string $value, ?int $position)
     {
@@ -68,7 +68,7 @@ class Token
             return false;
         }
 
-        if (empty($values)) {
+        if (!$values) {
             return true;
         }