[MacPorts] #60738: py-gdal: Update to 3.1.1

[MacPorts]

#60738: py-gdal: Update to 3.1.1
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  Reporter:  ryandesign  |      Owner:  petrrr
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  py-gdal     |
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Comment (by Dave-Allured):

 GDAL 3.1.2 is released.
 https://lists.osgeo.org/pipermail/gdal-announce/2020-July/000082.html

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Ticket URL: <https://trac.macports.org/ticket/60738#comment:2>
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