[MacPorts] #61150: gdal @3.1.2: update to 3.1.3

[MacPorts]

#61150: gdal @3.1.2: update to 3.1.3
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 Reporter:  Dave-Allured  |      Owner:  Veence
     Type:  update        |     Status:  assigned
 Priority:  Low           |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  gdal
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 Bug fix release.

 https://lists.osgeo.org/pipermail/gdal-announce/2020-September/000083.html

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Ticket URL: <https://trac.macports.org/ticket/61150>
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