Fix phpstan issues

src/Bundle/ChillMainBundle/Audit/RemoveOldAuditCronJob.php

@@ -31,6 +31,8 @@ final readonly class RemoveOldAuditCronJob implements CronJobInterface
         $config = $bag->get('chill_main.audit_trail');
         if (is_array($config) && is_string($intervalString = $config['delete_after'] ?? null)) {
             $this->deleteBefore = new \DateInterval($intervalString);
+        } else {
+            throw new \InvalidArgumentException('Invalid configuration for delete_after interval');
         }
     }