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/config/Resource/SelfCheckingResourceInterface.php

@@ -23,8 +23,6 @@ interface SelfCheckingResourceInterface extends ResourceInterface
      * Returns true if the resource has not been updated since the given timestamp.
      *
      * @param int $timestamp The last time the resource was loaded
-     *
-     * @return bool
      */
-    public function isFresh(int $timestamp);
+    public function isFresh(int $timestamp): bool;
 }