feat: add reqs

Author: giancarloromeo

services/notifications/requirements/_base.in

@@ -6,6 +6,7 @@
 --constraint ./constraints.txt
 
 # intra-repo required dependencies
+--requirement ../../../packages/celery-library/requirements/_base.in
 --requirement ../../../packages/common-library/requirements/_base.in
 --requirement ../../../packages/models-library/requirements/_base.in
 --requirement ../../../packages/settings-library/requirements/_base.in