[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):

 Well there are only two subports—graphviz-gui and gvedit—in addition to
 the main graphviz port that you've already tested. Would be good to verify
 that the two subports install. (And it is the graphviz-gui subport that
 would be affected by the aforementioned #57137 problem on macOS Mojave and
 later.) That's the extent of what I usually do when updating a port.

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Ticket URL: <https://trac.macports.org/ticket/62165#comment:6>
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