[MacPorts] #71013: qt6: Update to future 6.8.0 to support macOS 15.

[MacPorts]

#71013: qt6: Update to future 6.8.0 to support macOS 15.
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  Reporter:  cgilles  |      Owner:  MarcusCalhoun-Lopez
      Type:  update   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  sequoia
      Port:  qt6      |
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Comment (by cgilles):

 Hi Renee,

 What's doesn't works with QtWebEngine exactly? I'm faced many problems
 with it. The last one have been reported here:

 https://bugreports.qt.io/browse/QTBUG-129346

 It's for Qt 6.7.3 and 6.8.0.

 Anyway, you need 4Gb of RAM by core to compile QtWebEngine, else the
 linking will fail. So one core 4Gb, 2 cores 8Gb, etc... Here on my Macbook
 pro M1 16Gb, i created a VM Linux arm64 with 11 Gb and i compile
 QtWebEngine on 2 cores. It takes 8 hours to complete.

 Best

 Gilles Caulier

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Ticket URL: <https://trac.macports.org/ticket/71013#comment:3>
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