[MacPorts] #66409: asciidoctor @2.0.18: temporarily switch back to ruby30

[MacPorts]

#66409: asciidoctor @2.0.18: temporarily switch back to ruby30
---------------------------------------------+-----------------------------
  Reporter:  aeiouaeiouaeiouaeiouaeiouaeiou  |      Owner:  (none)
      Type:  defect                          |     Status:  new
  Priority:  Normal                          |  Milestone:
 Component:  ports                           |    Version:  2.8.0
Resolution:                                  |   Keywords:  mountainlion
      Port:  asciidoctor                     |  mavericks
---------------------------------------------+-----------------------------
Changes (by aeiouaeiouaeiouaeiouaeiouaeiou):

 * keywords:  lion mountainlion => mountainlion mavericks
 * version:   => 2.8.0


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Ticket URL: <https://trac.macports.org/ticket/66409#comment:1>
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