[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:  assigned
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  poppler
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 the latest poppler version is 0.68.0

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