[MacPorts] #62165: graphviz: Update to 2.46.0

[MacPorts]

#62165: graphviz: Update to 2.46.0
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  Reporter:  jarrodmillman             |      Owner:  ryandesign
      Type:  update                    |     Status:  accepted
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:
Resolution:                            |   Keywords:
      Port:  graphviz, graphviz-devel  |
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Comment (by ryandesign):

 The Portfile tries to extract the GVEdit version number from a known
 location in the source code. That location has apparently changed by this
 point in GVEdit's development, so you would need to investigate where the
 version number is now stored in the source and adjust the command
 accordingly.

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Ticket URL: <https://trac.macports.org/ticket/62165#comment:9>
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