[MacPorts] #60135: gdal: update to version 3.1.0

[MacPorts]

#60135: gdal: update to version 3.1.0
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  Reporter:  Dave-Allured  |      Owner:  Veence
      Type:  update        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:  fixed         |   Keywords:
      Port:  gdal          |
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Comment (by Dave-Allured):

 Missed latest version 3.1.0.  I assume that a new ticket must be filed.

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Ticket URL: <https://trac.macports.org/ticket/60135#comment:4>
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