[MacPorts] #44056: grass: upgrade to 7.0.0

[MacPorts]

#44056: grass: upgrade to 7.0.0
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  Reporter:  mojca@…  |      Owner:  macports-tickets@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  grass    |
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Comment (by petr@…):

 I am just looking though the Portfile. Is there a good reason to stick
 with `proj47`? Can't we use `proj`, i.e. version 4.8? I have not found any
 hint that the current version would not be compatible.

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Ticket URL: <https://trac.macports.org/ticket/44056#comment:12>
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