Update sidekiq-cron to v1.12.0

What does this MR do and why?

This fixes an issue where connections may get checked out without sending any data: https://github.com/sidekiq-cron/sidekiq-cron/pull/438

Diff: https://my.diffend.io/gems/sidekiq-cron/1.10.1/1.12.0

Changes: https://github.com/sidekiq-cron/sidekiq-cron/blob/master/CHANGELOG.md

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