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/dotenv/Exception/FormatExceptionContext.php

@@ -16,10 +16,10 @@ namespace Symfony\Component\Dotenv\Exception;
  */
 final class FormatExceptionContext
 {
-    private $data;
-    private $path;
-    private $lineno;
-    private $cursor;
+    private string $data;
+    private string $path;
+    private int $lineno;
+    private int $cursor;
 
     public function __construct(string $data, string $path, int $lineno, int $cursor)
     {