[MacPorts] #72531: qgis3: Update to 3.42.3

[MacPorts]

#72531: qgis3: Update to 3.42.3
---------------------------+----------------------
  Reporter:  multiquadric  |      Owner:  Veence
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  qgis3         |
---------------------------+----------------------

Comment (by ryandesign):

 Let's keep this ticket for tracking the request to update the port to a
 new version and #72542 for the bug report about the failure to build due
 to newer sip.

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Ticket URL: <https://trac.macports.org/ticket/72531#comment:11>
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