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

[MacPorts]

#66409: asciidoctor @2.0.18: temporarily switch back to ruby30
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 Reporter:  aeiouaeiouaeiouaeiouaeiouaeiou  |      Owner:  (none)
     Type:  defect                          |     Status:  new
 Priority:  Normal                          |  Milestone:
Component:  ports                           |    Version:
 Keywords:  lion mountainlion               |       Port:  asciidoctor
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 https://github.com/macports/macports-
 ports/commit/93b793acfebdc3fb04d6d2f2511d11192b16b7e6

 https://trac.macports.org/ticket/66054

 I cannot update ccache because it depends on it.

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