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/console/Command/SignalableCommandInterface.php

@@ -25,6 +25,10 @@ interface SignalableCommandInterface
 
     /**
      * The method will be called when the application is signaled.
+     *
+     * @param int|false $previousExitCode
+     *
+     * @return int|false The exit code to return or false to continue the normal execution
      */
-    public function handleSignal(int $signal): void;
+    public function handleSignal(int $signal, /* int|false $previousExitCode = 0 */);
 }