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/RouteCompilerInterface.php

@@ -21,10 +21,8 @@ interface RouteCompilerInterface
     /**
      * Compiles the current route instance.
      *
-     * @return CompiledRoute
-     *
      * @throws \LogicException If the Route cannot be compiled because the
      *                         path or host pattern is invalid
      */
-    public static function compile(Route $route);
+    public static function compile(Route $route): CompiledRoute;
 }