DX: rector rules upt to PHP 74

src/Bundle/ChillActivityBundle/DependencyInjection/Configuration.php

@@ -59,9 +59,7 @@ class Configuration implements ConfigurationInterface
             ->info('The number of seconds of this duration. Must be an integer.')
             ->cannotBeEmpty()
             ->validate()
-            ->ifTrue(static function ($data) {
-                return !is_int($data);
-            })->thenInvalid('The value %s is not a valid integer')
+            ->ifTrue(static fn($data) => !is_int($data))->thenInvalid('The value %s is not a valid integer')
             ->end()
             ->end()
             ->scalarNode('label')