[MacPorts] #64518: Update Qt5 to last stable 5.15.14

[MacPorts]

#64518: Update Qt5 to last stable 5.15.14
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  Reporter:  cgilles  |      Owner:  MarcusCalhoun-Lopez
      Type:  update   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  qt5      |
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Comment (by reneeotten):

 @cgilles - that wasn't actually that difficult, just time consuming to
 update all the checksums and build all subport locally to make sure they
 work (at least on my system)... The PR is [https://github.com/macports
 /macports-ports/pull/25493 here]; feel free to give it a try and provide
 feedback.

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Ticket URL: <https://trac.macports.org/ticket/64518#comment:12>
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