[MacPorts] #57991: ruby26: update to 2.6.1

[MacPorts]

#57991: ruby26: update to 2.6.1
----------------------+--------------------
 Reporter:  pmetzger  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  ruby26
----------------------+--------------------
 There's a new patch release of ruby out, see: https://www.ruby-
 lang.org/en/news/2019/01/30/ruby-2-6-1-released/

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Ticket URL: <https://trac.macports.org/ticket/57991>
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