Temporarily allow sidekiq warning

It's already fixed on main but not released yet

Author: Earlopain

activesupport/lib/active_support/testing/strict_warnings.rb

@@ -10,6 +10,8 @@ class WarningError < StandardError; end
     PROJECT_ROOT = File.expand_path("../../../../", __dir__)
     ALLOWED_WARNINGS = Regexp.union(
       /circular require considered harmful.*delayed_job/, # Bug in delayed job.
+      # TODO: Remove with the next sidekiq version bump
+      /circular require considered harmful.*sidekiq/,
 
       # Expected non-verbose warning emitted by Rails.
       /Ignoring .*\.yml because it has expired/,