[MacPorts] #71810: gtk4: update to 4.16.12

[MacPorts]

#71810: gtk4: update to 4.16.12
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 Reporter:  mohd-akram  |      Owner:  mascguy
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  gtk4
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Ticket URL: <https://trac.macports.org/ticket/71810>
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