[MacPorts] #33972: gtk3: update to 3.4.x

[MacPorts]

#33972: gtk3: update to 3.4.x
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 Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
     Type:  update                   |      Status:  new                                  
 Priority:  Normal                   |   Milestone:                                       
Component:  ports                    |     Version:                                       
 Keywords:                           |        Port:  gtk3                                 
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 gtk3 is at version 3.0.12 but version 3.4.x is available.

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Ticket URL: <https://trac.macports.org/ticket/33972>
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