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/Exception/FileLocatorFileNotFoundException.php

@@ -18,7 +18,7 @@ namespace Symfony\Component\Config\Exception;
  */
 class FileLocatorFileNotFoundException extends \InvalidArgumentException
 {
-    private $paths;
+    private array $paths;
 
     public function __construct(string $message = '', int $code = 0, \Throwable $previous = null, array $paths = [])
     {
@@ -27,6 +27,9 @@ class FileLocatorFileNotFoundException extends \InvalidArgumentException
         $this->paths = $paths;
     }
 
+    /**
+     * @return array
+     */
     public function getPaths()
     {
         return $this->paths;