[MacPorts] #38575: gdk-pixbuf2: update to 2.28.0

[MacPorts]

#38575: gdk-pixbuf2: update to 2.28.0
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 Reporter:  cal@…   |      Owner:  devans@…
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.1.3
 Keywords:          |       Port:  gdk-pixbuf2
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 The attached patch updates gdk-pixbuf2 to the current version 2.28.0.

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Ticket URL: <https://trac.macports.org/ticket/38575>
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