[MacPorts] #45753: saga: link against proj 4.8 instead of 4.7 and update

[MacPorts]

#45753: saga: link against proj 4.8 instead of 4.7 and update
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 Reporter:  petr@…  |      Owner:  vince@…
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  saga
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 I understand that saga is documented to work with proj 4.8 and any earlier
 versions are not supported upstream. Please update the port to use
 `port:proj`. This will also help to deprecate proj47.

 Note also that version 2.1.3 was released recently, you might want to
 update as well.

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Ticket URL: <https://trac.macports.org/ticket/45753>
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