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www/ruby-actioncable72: add package version 7.2.2.1

Action Cable - Integrated WebSockets for Rails

Action Cable seamlessly integrates WebSockets with the rest of your Rails
application.

It allows for real-time features to be written in Ruby in the same style and
form as the rest of your Rails application, while still being performant and
scalable.  It's a full-stack offering that provides both a client-side
JavaScript framework and a server-side Ruby framework.  You have access to
your full domain model written with Active Record or your ORM of choice.