fix cs with php-cs-fixer 3.49

src/Bundle/ChillPersonBundle/Export/Aggregator/AccompanyingPeriodStepHistoryAggregators/ByClosingMotiveAggregator.php

@@ -40,7 +40,7 @@ final readonly class ByClosingMotiveAggregator implements AggregatorInterface
 
     public function getLabels($key, array $values, mixed $data)
     {
-        return function (null|int|string $value): string {
+        return function (int|string|null $value): string {
             if ('_header' === $value) {
                 return 'export.aggregator.step_history.by_closing_motive.header';
             }