[MacPorts] #57056: poppler: update to 0.68.0

[MacPorts]

#57056: poppler: update to 0.68.0
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  Reporter:  pmetzger  |      Owner:  dbevans
      Type:  update    |     Status:  accepted
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  poppler   |
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Changes (by dbevans):

 * status:  assigned => accepted


Comment:

 I have a build fix for this upgrade and am doing final testing now.
 Barring future issues, I should be able update poppler and its dependents
 by tomorrow morning at the lastest.

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Ticket URL: <https://trac.macports.org/ticket/57056#comment:2>
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