www/ruby-actioncable52: add version 5.2.2 package

Add ruby-actioncable52 version 5.2.2 package.

# 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.

This is for Ruby on Rails 5.2.

(taca)