[MacPorts] #62165: graphviz: Update to 2.48.0

[MacPorts]

#62165: graphviz: Update to 2.48.0
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  Reporter:  jarrodmillman             |      Owner:  mascguy
      Type:  update                    |     Status:  assigned
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:
Resolution:                            |   Keywords:
      Port:  graphviz, graphviz-devel  |
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Comment (by jarrodmillman):

 I am happy to see this moving forward!  FYI, graphviz 2.49.1 is the
 current stable release now:
 https://gitlab.com/graphviz/graphviz/-/releases

 Here is the changelog:
 https://gitlab.com/graphviz/graphviz/-/blob/main/CHANGELOG.md

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Ticket URL: <https://trac.macports.org/ticket/62165#comment:32>
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