[MacPorts] #40486: Update multimarkdown to 4.3

[MacPorts]

#40486: Update multimarkdown to 4.3
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 Reporter:  521E328E-2A13-4749-826A-             |      Owner:  macports-
  E4EF4F22A0F1@…                                 |  tickets@…
     Type:  update                               |     Status:  new
 Priority:  Normal                               |  Milestone:
Component:  ports                                |    Version:  2.2.0
 Keywords:  haspatch                             |       Port:
                                                 |  multimarkdown
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 Patch attached

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Ticket URL: <https://trac.macports.org/ticket/40486>
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