adjust make:subscriber test

Author: kbond

tests/Maker/MakeSubscriberTest.php

@@ -39,7 +39,7 @@ public function getTestDetails(): \Generator
                 );
 
                 self::assertStringContainsString(
-                    'KernelEvents::REQUEST => \'onKernelRequest\'',
+                    'RequestEvent::class => \'onRequestEvent\'',
                     file_get_contents($runner->getPath('src/EventSubscriber/FooBarSubscriber.php'))
                 );
             }),