[Mailer] Switching to new config format

Author: ThomasLandauer

mailer.rst

@@ -55,14 +55,10 @@ over SMTP by configuring the DSN in your ``.env`` file (the ``user``,
 
  // config/packages/mailer.php
  use function Symfony\Component\DependencyInjection\Loader\Configurator\env;
- use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
-
- return static function (ContainerConfigurator $container): void {
- $container->extension('framework', [
- 'mailer' => [
- 'dsn' => env('MAILER_DSN'),
- ],
- ]);
+ use Symfony\Config\FrameworkConfig;
+
+ return static function (FrameworkConfig $framework): void {
+ $framework->mailer()->dsn(env('MAILER_DSN'));
  };
 
 .. caution::