[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:  reneeotten
      Type:  update   |     Status:  accepted
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  sequoia
      Port:  qt6      |
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Changes (by reneeotten):

 * status:  assigned => accepted
 * owner:  MarcusCalhoun-Lopez => reneeotten


Comment:

 I have done the update to 6.8.0 and am currently building the last
 subports to make sure that everything works. But at least the
 {{{qt6-qtwebengine}}} port builds successfully now, that was the final
 issue I had when attempting to update to 6.7.3.

 Assuming that everything else works properly, I will commit the update
 sometime this weekend.

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Ticket URL: <https://trac.macports.org/ticket/71013#comment:6>
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