/usr/lib/ruby/vendor_ruby/ is in ruby-sidekiq-cron 0.4.2-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/sidekiq-cron.rb
/usr/lib/ruby/vendor_ruby/sidekiq/
/usr/lib/ruby/vendor_ruby/sidekiq/cron.rb
/usr/lib/ruby/vendor_ruby/sidekiq/cron/
/usr/lib/ruby/vendor_ruby/sidekiq/cron/poller.rb
/usr/lib/ruby/vendor_ruby/sidekiq/cron/locales/
/usr/lib/ruby/vendor_ruby/sidekiq/cron/locales/en.yml
/usr/lib/ruby/vendor_ruby/sidekiq/cron/locales/de.yml
/usr/lib/ruby/vendor_ruby/sidekiq/cron/web.rb
/usr/lib/ruby/vendor_ruby/sidekiq/cron/job.rb
/usr/lib/ruby/vendor_ruby/sidekiq/cron/views/
/usr/lib/ruby/vendor_ruby/sidekiq/cron/views/cron.erb
/usr/lib/ruby/vendor_ruby/sidekiq/cron/views/cron.slim
/usr/lib/ruby/vendor_ruby/sidekiq/cron/web_extension.rb
/usr/lib/ruby/vendor_ruby/sidekiq/cron/launcher.rb