[MacPorts] #70357: gnuplot: Update to v6

[MacPorts]

#70357: gnuplot: Update to v6
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  Reporter:  kickingvegas  |      Owner:  mojca
      Type:  update        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:  fixed         |   Keywords:
      Port:  gnuplot       |
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Comment (by jmroot):

 Replying to [comment:7 kickingvegas]:
 > For some reason it wishes to install qt4-mac for x86_64 arch.

 qt4-mac simply doesn't support arm64. https://github.com/macports
 /macports-ports/blob/master/aqua/qt4-mac/Portfile#L478

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Ticket URL: <https://trac.macports.org/ticket/70357#comment:11>
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