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/framework-bundle/DataCollector/AbstractDataCollector.php

@@ -23,11 +23,6 @@ abstract class AbstractDataCollector extends DataCollector implements TemplateAw
         return static::class;
     }
 
-    public function reset(): void
-    {
-        $this->data = [];
-    }
-
     public static function getTemplate(): ?string
     {
         return null;