[MacPorts] #62165: Update to Graphviz 2.46.0

[MacPorts]

#62165: Update to Graphviz 2.46.0
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 Reporter:  jarrodmillman  |      Owner:  (none)
     Type:  update         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:
 Keywords:                 |       Port:
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 I am a code developer of PyGraphviz
 (https://github.com/pygraphviz/pygraphviz) and NetworkX
 (https://github.com/networkx/networkx).  Some of our users use macports.
 Unfortunately, the version of Graphviz that you distribute (2.40.1)
 doesn't work well with Pygraphviz b/c of several known bugs.  I believe
 Graphviz 2.40.1 came out in 2016 and they've made a lot of improvements
 since then.

 It would be great if you could update to the current stable release
 (2.46.0):
 https://gitlab.com/graphviz/graphviz/-/blob/master/CHANGELOG.md#2460-2021-01-18

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