[MacPorts] #60784: gdal @3.1.1: update to 3.1.2

[MacPorts]

#60784: gdal @3.1.1: update to 3.1.2
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  Reporter:  Dave-Allured  |      Owner:  Veence
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  gdal, gmt     |
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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/60784#comment:2>
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