[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 jjstickel):

 I ran into another problem with gvedit. The download from the "releases"
 page on gitlab,
 `https://gitlab.com/graphviz/graphviz/-/archive/2.47.0/graphviz-2.47.0.tar.gz`
 is not quite the same as the official release on graphviz.org,
 `https://gitlab.com/graphviz/graphviz/-/package_files/8183714/download`.
 The former is the default using gitlab setup and does work for graphviz.
 Unfortunately, I don't know how to specify `master_sites` or
 `distfilename` for the latter, which has additional build files included
 for gvedit.

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Ticket URL: <https://trac.macports.org/ticket/62165#comment:12>
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