[MacPorts] #71013: Update Qt6 to future 6.8.0 to support macOS 15.

[MacPorts]

#71013: Update Qt6 to future 6.8.0 to support macOS 15.
-------------------------+--------------------
 Reporter:  cgilles      |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  qt6
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 Hi,

 I just tried to compile Qt 6.8.0-rc under my Linux unbuntu 24.04.1 arm64
 VM under my macOS Silicon, and all compile fine.

 6.8.0 is near to be released and this version support macOS 15 as listed
 in the release note:

 https://doc-snapshots.qt.io/qt6-6.8/whatsnew68.html

 Note: the last and final 6.7.3 is already released few days ago. If you
 don't want to switch to 6.8, at least 6.7.3 will be a good point.

 Best

 Gilles Caulier

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