[MacPorts] #34435: Update GIMP to 2.8.0

[MacPorts]

#34435: Update GIMP to 2.8.0
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 Reporter:  singingwolfboy@…             |       Owner:  devans@…           
     Type:  defect                       |      Status:  new                
 Priority:  Normal                       |   Milestone:                     
Component:  ports                        |     Version:  2.0.4              
 Keywords:                               |        Port:  gimp2              
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Comment(by djrumbold@…):

 Is this issue a dupe of #34341 ?

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Ticket URL: <https://trac.macports.org/ticket/34435#comment:1>
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