[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
Resolution:          |   Keywords:
      Port:  zim     |
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Comment (by mf2k):

 Thanks. [https://guide.macports.org/#development.patches Per the
 guidelines], please instead attach a unified diff of the Portfile so we
 can easily see what changes you are proposing. Or better yet,
 [wiki:WorkingWithGit#pr submit a pull request].

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Ticket URL: <https://trac.macports.org/ticket/58588#comment:1>
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