Bump sidekiq from 5.0.3 to 5.0.4
Bump sidekiq from 5.0.3 to 5.0.4

Bumps [sidekiq](https://github.com/mperham/sidekiq) from 5.0.3 to 5.0.4.
- [Changelog](https://github.com/mperham/sidekiq/blob/master/Changes.md)
- [Commits](https://github.com/mperham/sidekiq/compare/v5.0.3...v5.0.4)
ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2,ministryofjustice/prison-visits-2