[MacPorts] #63633: gtk4: add new port

[MacPorts]

#63633: gtk4: add new port
-------------------------+----------------------
 Reporter:  mascguy      |      Owner:  mascguy
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  gnome        |       Port:  gtk4
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 It looks like we're behind-the-curve, in terms of supporting upstream GTK
 releases. Add a new port for `gtk4`.

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Ticket URL: <https://trac.macports.org/ticket/63633>
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