[MacPorts] #63247: qgis3: Build does not honor selected python version

[MacPorts]

#63247: qgis3: Build does not honor selected python version
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  Reporter:  aaschwanden  |      Owner:  Veence
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  qgis3        |
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Comment (by piyushrpt):

 This is likely caused by this line using `PYTHON_EXECUTABLE` instead of
 `Python_EXECUTABLE`, related to deprecation of `FindPythonInterp` in favor
 of `FindPython` in cmake.

 https://github.com/macports/macports-
 ports/blob/master/gis/qgis3/Portfile#L202

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Ticket URL: <https://trac.macports.org/ticket/63247#comment:4>
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