[MacPorts] #33511: duplicity update to 0.6.18

[MacPorts]

#33511: duplicity update to 0.6.18
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 Reporter:  avelo@…            |       Owner:  macports-tickets@…                   
     Type:  update             |      Status:  new                                  
 Priority:  Normal             |   Milestone:                                       
Component:  ports              |     Version:  2.0.4                                
 Keywords:                     |        Port:  duplicity                            
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Ticket URL: <https://trac.macports.org/ticket/33511>
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