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/twig-bundle/DependencyInjection/Compiler/TwigLoaderPass.php

@@ -23,6 +23,9 @@ use Symfony\Component\DependencyInjection\Reference;
  */
 class TwigLoaderPass implements CompilerPassInterface
 {
+    /**
+     * @return void
+     */
     public function process(ContainerBuilder $container)
     {
         if (false === $container->hasDefinition('twig')) {