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

[MacPorts]

#60737: gdal-grass: Update to 3.1.1
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  Veence
      Type:  update      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gdal-grass  |
-------------------------+----------------------

Comment (by Veence):

 You’re right Ryan, this port should be somehow overhauled. I’m unfamiliar
 so far with the writing of sub-ports, so that might be a good opportunity
 to catch up.
 I’ll try and take care of this tomorrow.

-- 
Ticket URL: <https://trac.macports.org/ticket/60737#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS