[MacPorts] #35065: gimp2, gimp, gimp-app: update to 2.8.0

[MacPorts]

#35065: gimp2, gimp, gimp-app: update to 2.8.0
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 Reporter:  kurtjaeke@…       |       Owner:  macports-tickets@…                   
     Type:  update            |      Status:  new                                  
 Priority:  Normal            |   Milestone:                                       
Component:  ports             |     Version:  2.1.1                                
 Keywords:                    |        Port:  gimp2, gimp, gimp-app                
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 update gimp2, gimp, gimp-app to 2.8.0.

 Depends on #35064, #35062.

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Ticket URL: <https://trac.macports.org/ticket/35065>
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