[MacPorts] #58841: Update Qt5 ports to Qt 5.13

[MacPorts]

#58841: Update Qt5 ports to Qt 5.13
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  Reporter:  pmetzger  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  Qt5       |
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Comment (by pmetzger):

 Generally: it would be really nice if we could handle having *two*
 versions of a library in MacPorts. Having to delay upgrades until
 absolutely everything is ready is quite a pain.

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Ticket URL: <https://trac.macports.org/ticket/58841#comment:5>
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