Updated QUEUE_DRIVER env var to QUEUE_CONNECTION in phpunit.xml

phpunit.xml

@@ -27,7 +27,7 @@
         <env name="BCRYPT_ROUNDS" value="4"/>
         <env name="CACHE_DRIVER" value="array"/>
         <env name="SESSION_DRIVER" value="array"/>
-        <env name="QUEUE_DRIVER" value="sync"/>
+        <env name="QUEUE_CONNECTION" value="sync"/>
         <env name="MAIL_DRIVER" value="array"/>
     </php>
 </phpunit>