[MacPorts] #53166: yarn: default to an older nodejs on 10.6

[MacPorts]

#53166: yarn: default to an older nodejs on 10.6
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  Reporter:  mojca   |      Owner:  jambonrose
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  snowleopard
      Port:  yarn    |
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Comment (by jambonrose):

 I've opened a PR on Github that attempts to fix this issue:
 https://github.com/macports/macports-ports/pull/127

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Ticket URL: <https://trac.macports.org/ticket/53166#comment:2>
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