/usr/lib/ruby/vendor_ruby/ is in ruby-activeresource-3.2 3.2.6-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/active_resource/
/usr/lib/ruby/vendor_ruby/active_resource/base.rb
/usr/lib/ruby/vendor_ruby/active_resource/schema.rb
/usr/lib/ruby/vendor_ruby/active_resource/log_subscriber.rb
/usr/lib/ruby/vendor_ruby/active_resource/connection.rb
/usr/lib/ruby/vendor_ruby/active_resource/formats.rb
/usr/lib/ruby/vendor_ruby/active_resource/http_mock.rb
/usr/lib/ruby/vendor_ruby/active_resource/railtie.rb
/usr/lib/ruby/vendor_ruby/active_resource/custom_methods.rb
/usr/lib/ruby/vendor_ruby/active_resource/exceptions.rb
/usr/lib/ruby/vendor_ruby/active_resource/validations.rb
/usr/lib/ruby/vendor_ruby/active_resource/formats/
/usr/lib/ruby/vendor_ruby/active_resource/formats/xml_format.rb
/usr/lib/ruby/vendor_ruby/active_resource/formats/json_format.rb
/usr/lib/ruby/vendor_ruby/active_resource/observing.rb
/usr/lib/ruby/vendor_ruby/active_resource/version.rb
/usr/lib/ruby/vendor_ruby/active_resource.rb