[MacPorts] #73391: qpdf: 12.30 fails to build because c++20 is now required

[MacPorts]

#73391: qpdf: 12.30 fails to build because c++20 is now required
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 Reporter:  grr     |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  qpdf
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 https://github.com/qpdf/qpdf/issues/1543
 > From 12.3, C++20 will be required to build qpdf.

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Ticket URL: <https://trac.macports.org/ticket/73391>
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