Update devel/ruby-highline to 1.6.5

Changelog:

== 1.6.5

* HighLine#list() now correctly handles empty lists (fix by Lachlan Dowding).
* HighLine#list() now supports <tt>:uneven_columns_across</tt> and
  <tt>:uneven_columns_down</tt> modes.

  == 1.6.4

  * Add introspection methods to color_scheme: definition, keys, to_hash.
  * Add tests for new methods.

  == 1.6.3

  * Add color NONE.
  * Add RGB color capability.
  * Made 'color' available as a class or instance method of HighLine, for
    instance: HighLine.color("foo", :blue)) or highline_obj.color("foo", :blue)
    are now both possible and equivalent.
  * Add HighLine::String class with convenience methods: #color (alias
    #foreground), #on (alias #background), colors, and styles. See
    lib/string_extensions.rb.
  * Add (optional) ability to extend String with the same convenience methods from
    HighLine::String, using Highline.colorize_strings.

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