php csfixes

src/Bundle/ChillActivityBundle/Export/Aggregator/ACPAggregators/ByActivityNumberAggregator.php

@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-/**
+/*
  * Chill is a software for social workers
  *
  * For the full copyright and license information, please view
@@ -41,7 +41,7 @@ class ByActivityNumberAggregator implements AggregatorInterface
 
     public function getLabels($key, array $values, $data)
     {
-        return function ($value): string {
+        return static function ($value): string {
             if ('_header' === $value) {
                 return '';
             }