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/framework-bundle/Resources/config/test.php

@@ -38,7 +38,6 @@ return static function (ContainerConfigurator $container) {
         ->set('test.session.listener', SessionListener::class)
             ->args([
                 service_locator([
-                    'session' => service('.session.do-not-use')->ignoreOnInvalid(),
                     'session_factory' => service('session.factory')->ignoreOnInvalid(),
                 ]),
                 param('kernel.debug'),