Use force: cascade to drop dependent objects on deprecated ci_services table
From gitlab-org/gitlab-ce#22298:
PG::DependentObjectsStillExist: ERROR: cannot drop table ci_services because other objects depend on it
DETAIL: default for table services column id depends on sequence services_id_seq
HINT: Use DROP ... CASCADE to drop the dependent objects too
This can happen if entries in other tables still depend on ci_services
.