Merge pull request #3755 from alphagov/sidekiq-unique-jobs-lock-ttl

Define SidekiqUniqueJobs lock_ttl as an integer

Author: mike3985

config/initializers/sidekiq.rb

@@ -1,6 +1,6 @@
 SidekiqUniqueJobs.configure do |config|
   config.enabled = !Rails.env.test? # SidekiqUniqueJobs recommends not testing this behaviour https://github.com/mhenrixon/sidekiq-unique-jobs#uniqueness
-  config.lock_ttl = 1.hour
+  config.lock_ttl = 1.hour.to_i
 end
 
 Sidekiq.configure_client do |config|