[MacPorts] #35530: duplicity: Upgrade to 0.6.19

[MacPorts]

#35530: duplicity: Upgrade to 0.6.19
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 Reporter:  521E328E-2A13-4749-826A-E4EF4F22A0F1@…              |       Owner:  macports-tickets@…                   
     Type:  enhancement                                         |      Status:  new                                  
 Priority:  Normal                                              |   Milestone:                                       
Component:  ports                                               |     Version:  2.1.2                                
 Keywords:  haspatch                                            |        Port:  duplicity                            
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 Patch to upgrade duplicity from 0.6.18 → 0.6.19.

 This should also close ticket #35209 (current version fails with ssh
 backends).

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Ticket URL: <https://trac.macports.org/ticket/35530>
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