Revert billiard update to version actually installed (#3036)
Revert billiard update to version actually installed (#3036)

* Revert billiard update to version actually installed

* Pin billiard with pyup; update when celery version upgraded

uwcirg/true_nth_usa_portal,uwcirg/true_nth_usa_portal,uwcirg/true_nth_usa_portal,uwcirg/true_nth_usa_portal