[MacPorts] #60876: Upgrade GIMP2 port to GIMP 2.10.20

[MacPorts]

#60876: Upgrade GIMP2 port to GIMP 2.10.20
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  Reporter:  jacbou  |      Owner:  dbevans
      Type:  update  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  gimp2   |
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Comment (by mascguy):

 This does indeed appear to be resolved. I've installed the Quartz variant
 of GIMP 2.10.20 on MacOS 10.12, 10.13, 10.14, and 10.15, and it works
 beautifully in all four environments.

 Thank you so much for upgrading this port. You folks are awesome!

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Ticket URL: <https://trac.macports.org/ticket/60876#comment:5>
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