Update Sidekiq-cron to fix compatibility issues with Sidekiq 4.2.1

The "Enqueue Now" button would not work in the admin panel due to changes in the Web extension interface: https://github.com/ondrejbartas/sidekiq-cron/commit/88ada926132d4658e3fd370c9f44899b6c88ccaf

Closes #24376

See merge request !7815