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

[MacPorts]

#57750: Please update port for yarn to 1.12.3
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 Reporter:  mattbishop  |      Owner:  (none)
     Type:  request     |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  yarn
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 Yarn updated to 1.12.3 on Nov. 7th. I'm asking the maintainer to please
 update this port. If they are unable to then please let us know so a new
 maintainer can take over.

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