Revert "Update celery"

This reverts commit 50cb7f07.

api/requirements/base.txt

@@ -18,7 +18,7 @@ django-redis~=4.12.0
 redis~=3.5.0
 kombu~=5.0.0
 
-celery~=5.1.2
+celery~=5.0.0
 
 # Your custom requirements go here
 django-cors-headers~=3.7.0