[MacPorts] #71997: Update Qt6 to last stable 6.8.2

[MacPorts]

#71997: Update Qt6 to last stable 6.8.2
---------------------+--------------------
 Reporter:  cgilles  |      Owner:  (none)
     Type:  update   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  qt6
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 Release note:
 [https://code.qt.io/cgit/qt/qtreleasenotes.git/about/qt/6.8.2/release-
 note.md]

 Download:
 [https://download.qt.io/official_releases/qt/6.8/6.8.2/single/]

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Ticket URL: <https://trac.macports.org/ticket/71997>
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