[MacPorts] #62346: Update pandoc to 2.11.4

[MacPorts]

#62346: Update pandoc to 2.11.4
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 Reporter:  szhorvat  |      Owner:  (none)
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.6.4
 Keywords:            |       Port:  pandoc
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 This is a request to update pandoc to the latest version (currently
 2.11.4).

 This is one of those unfortunate situations where the project website
 recommends Homebrew and the MacPorts version tends to be out of date.

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Ticket URL: <https://trac.macports.org/ticket/62346>
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