[MacPorts] #66975: qt6: update to 6.7

[MacPorts]

#66975: qt6: update to 6.7
--------------------------+---------------------------------
  Reporter:  MaddTheSane  |      Owner:  MarcusCalhoun-Lopez
      Type:  update       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.8.1
Resolution:               |   Keywords:
      Port:  qt6          |
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Comment (by reneeotten):

 I have most of the {{{py-pyqt6*}}} ports building locally but need to iron
 out a few kinks before committing them (I anyway want to wait for the PR
 mentioned above to be merged as to avoid rebuilds as much as possible).

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Ticket URL: <https://trac.macports.org/ticket/66975#comment:16>
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