Cleanup option names

See merge request !4

* For >=5.68, we expect 'civicrm_queue.runner' to be deprecated.
* For >=5.68, we should use 'civicrm_queue.agent' instead
* For <5.68, we must still use 'civicrm_queue.runner'
* This also allows admins to improvise on queries

#2 Update composer

See merge request !3