[MacPorts] #57750: Please update port for yarn to 1.12.3

[MacPorts]

#57750: Please update port for yarn to 1.12.3
-------------------------+------------------------
  Reporter:  mattbishop  |      Owner:  jambonrose
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  yarn        |
-------------------------+------------------------
Changes (by jmroot):

 * owner:  (none) => jambonrose
 * cc: isomarcte (added)
 * status:  new => assigned
 * type:  request => update


Comment:

 Please remember to assign to and/or Cc the maintainers, or they will not
 be notified of the existence of the ticket.

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Ticket URL: <https://trac.macports.org/ticket/57750#comment:1>
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