[MacPorts] #52400: Update gimp ports to use webkit2-gtk

[MacPorts]

#52400: Update gimp ports to use webkit2-gtk
------------------------+-------------------------------------
 Reporter:  jeremyhu@…  |      Owner:  devans@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.4
 Keywords:  removal     |       Port:  gimp2 gimp2-devel gimp3
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 Please update gimp2, gimp2-devel, and gimp3-devel to use webkit2-gtk
 rather than webkit-gtk.

 The older version of webkit-gtk hasn't been supported upstream for quite
 some time and is full of vulnerabilities.

 See #52399

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Ticket URL: <https://trac.macports.org/ticket/52400>
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