fix merge

Author: nicolas-grekas

DependencyInjection/FrameworkExtension.php

@@ -978,7 +978,7 @@ private function registerSessionConfiguration(array $config, ContainerBuilder $c
             // Set the handler class to be null
             $container->getDefinition('session.storage.native')->replaceArgument(1, null);
             $container->getDefinition('session.storage.php_bridge')->replaceArgument(0, null);
-            $container->setAlias('session.handler', 'session.handler.native_file')->setPrivate(true);
+            $container->setAlias('session.handler', 'session.handler.native_file');
         } else {
             $container->resolveEnvPlaceholders($config['handler_id'], null, $usedEnvs);