[MacPorts] #57750: yarn: Update to version 1.12.3 (was: Please update port for yarn to 1.12.3)

[MacPorts]

#57750: yarn: Update to version 1.12.3
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  Reporter:  mattbishop  |      Owner:  jambonrose
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  yarn        |
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Ticket URL: <https://trac.macports.org/ticket/57750#comment:2>
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