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-foundation/Session/Storage/Handler/IdentityMarshaller.php

@@ -18,9 +18,6 @@ use Symfony\Component\Cache\Marshaller\MarshallerInterface;
  */
 class IdentityMarshaller implements MarshallerInterface
 {
-    /**
-     * {@inheritdoc}
-     */
     public function marshall(array $values, ?array &$failed): array
     {
         foreach ($values as $key => $value) {
@@ -32,9 +29,6 @@ class IdentityMarshaller implements MarshallerInterface
         return $values;
     }
 
-    /**
-     * {@inheritdoc}
-     */
     public function unmarshall(string $value): string
     {
         return $value;