[MacPorts] #70357: Update gnuplot to v6

[MacPorts]

#70357: Update gnuplot to v6
---------------------------+----------------------
  Reporter:  kickingvegas  |      Owner:  mojca
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:
      Port:  gnuplot       |
---------------------------+----------------------
Changes (by jmroot):

 * status:  new => assigned
 * owner:  (none) => mojca


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Ticket URL: <https://trac.macports.org/ticket/70357#comment:1>
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