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/http-kernel/Exception/HttpExceptionInterface.php

@@ -20,15 +20,11 @@ interface HttpExceptionInterface extends \Throwable
 {
     /**
      * Returns the status code.
-     *
-     * @return int
      */
-    public function getStatusCode();
+    public function getStatusCode(): int;
 
     /**
      * Returns response headers.
-     *
-     * @return array
      */
-    public function getHeaders();
+    public function getHeaders(): array;
 }