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/routing/Loader/Configurator/RouteConfigurator.php

@@ -40,7 +40,7 @@ class RouteConfigurator
      *
      * @return $this
      */
-    final public function host($host): self
+    final public function host(string|array $host): static
     {
         $this->addHost($this->route, $host);