fix unnecessary line of code (vyuldashev#312)

- after the merge of pull-request vyuldashev#304, this line can be removed.

Author: adm-bome

src/Queue/Jobs/RabbitMQJob.php

@@ -81,7 +81,6 @@ public function attempts(): int
         $data = $headers->getNativeData();
 
         $laravelAttempts = (int) Arr::get($data, 'laravel.attempts', 0);
-        $xDeathCount = (int) Arr::get($headers->getNativeData(), 'x-death.0.count', 0);
 
         return ($laravelAttempts) + 1;
     }