[MacPorts] #62755: digikam: update to 7.2.0

[MacPorts]

#62755: digikam: update to 7.2.0
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 Reporter:  mascguy  |      Owner:  cgilles
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  digikam
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 It looks like our Digikam port is a few major releases behind. And it's
 also failing to build across-the-board on our buildbots.

 Let's update to the latest release, if possible.

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Ticket URL: <https://trac.macports.org/ticket/62755>
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