[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 cgilles):

 Link to last Qt5 tarball
 https://download.qt.io/official_releases/qt/5.15/5.15.14/

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Ticket URL: <https://trac.macports.org/ticket/64518#comment:9>
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