[MacPorts] #57750: yarn: Update to version 1.12.3

[MacPorts]

#57750: yarn: Update to version 1.12.3
-------------------------+------------------------
  Reporter:  mattbishop  |      Owner:  jambonrose
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  yarn        |
-------------------------+------------------------

Comment (by mattbishop):

 Andrew, thank you for posting the update. I have another port I maintain
 and I was asking this question to see if you were OK with others
 submitting updates. In my years of time on various OS projects, one can
 never be sure how a maintainer will respond to someone else coming in and
 working on a piece they maintain.

 "Us" is myself and anyone else who has an interest in the yarn port.

 Thanks again for your efforts and time! Yarn is a great tool, and MacPorts
 is a great place to access it.

-- 
Ticket URL: <https://trac.macports.org/ticket/57750#comment:4>
MacPorts <https://www.macports.org/>
Ports system for macOS