[MacPorts] #60737: gdal-grass: Update to 3.1.1

[MacPorts]

#60737: gdal-grass: Update to 3.1.1
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 Reporter:  ryandesign  |      Owner:  Veence
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  gdal-grass
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 gdal-grass should probably be updated to 3.1.1 to match the recent update
 of gdal. Might want to add a comment to the gdal and gdal-grass portfiles
 to remind developers to update them at the same time. Or one way to ensure
 that would be to make gdal-grass a subport of gdal, since they appear to
 be released from the same place.

 The gdal-grass port's livecheck is not set up correctly and should be
 fixed.

 Its path to grass7 is probably wrong; it references grass-7.4.0 but the
 grass7 port's version is 7.8.3.

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Ticket URL: <https://trac.macports.org/ticket/60737>
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