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/Output/ConsoleOutputInterface.php

@@ -21,11 +21,12 @@ interface ConsoleOutputInterface extends OutputInterface
 {
     /**
      * Gets the OutputInterface for errors.
-     *
-     * @return OutputInterface
      */
-    public function getErrorOutput();
+    public function getErrorOutput(): OutputInterface;
 
+    /**
+     * @return void
+     */
     public function setErrorOutput(OutputInterface $error);
 
     public function section(): ConsoleSectionOutput;