Larval framework upated to v5.6.33

Updated laravel frameowrk version to as suggested for security patch update which was released in v5.6.30

vendor/laravel/framework/src/Illuminate/Queue/RedisQueue.php

@@ -162,7 +162,11 @@ class RedisQueue extends Queue implements QueueContract
     {
         $this->migrate($prefixed = $this->getQueue($queue));
 
-        list($job, $reserved) = $this->retrieveNextJob($prefixed);
+        if (empty($nextJob = $this->retrieveNextJob($prefixed))) {
+            return;
+        }
+
+        list($job, $reserved) = $nextJob;
 
         if ($reserved) {
             return new RedisJob(