[MacPorts] #44666: digikam: update to 4.2.0

[MacPorts]

#44666: digikam: update to 4.2.0
--------------------------+---------------------
 Reporter:  ryandesign@…  |      Owner:  jan@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  digikam
--------------------------+---------------------
 Shall we update digikam again?

 {{{
 $ port livecheck digikam
 digikam seems to have been updated (port version: 4.0.0, new version:
 4.2.0)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/44666>
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