[MacPorts] #58588: Update zim to current (gtk3) version (0.68 -> 0.71.1)

[MacPorts]

#58588: Update zim to current (gtk3) version (0.68 -> 0.71.1)
--------------------+--------------------
 Reporter:  kjyv    |      Owner:  (none)
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.5.4
 Keywords:          |       Port:  zim
--------------------+--------------------
 Zim has updated its dependencies to >= python3.2 and gtk >= 3.18.
 Just updating the dependencies in the Portfile worked alright for me.

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Ticket URL: <https://trac.macports.org/ticket/58588>
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