[MacPorts] #60824: undate duplicity, move depedencies to python 3.7

[MacPorts]

#60824: undate duplicity, move depedencies to python 3.7
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 Reporter:  diekhans  |      Owner:  (none)
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.6.2
 Keywords:            |       Port:  duplicity
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 Current Duplicity release is 0.8.14

 It now supports python 3.7, so please move from 2.7

 thanks!!!

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Ticket URL: <https://trac.macports.org/ticket/60824>
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