Bump Sidekiq to 5.2.7
Fixes minor bugs (https://github.com/mperham/sidekiq/blob/master/Changes.md#527) and keeps version used with gitlab-monitor consistent.
Edited by Stan Hu
Fixes minor bugs (https://github.com/mperham/sidekiq/blob/master/Changes.md#527) and keeps version used with gitlab-monitor consistent.