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

[MacPorts]

#60738: py-gdal: Update to 3.1.1
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  petrrr
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  py-gdal
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 py-gdal should probably be updated to 3.1.1 to match the recent update of
 gdal.

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