[MacPorts] #62165: graphviz: Update to 2.48.0

[MacPorts]

#62165: graphviz: Update to 2.48.0
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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 mascguy):

 PR created, covering both `graphviz` and `graphviz-devel`. Whether we'll
 want to update the Devel version first, followed by non-Devel, is up to
 Ryan. But hey, it's a start:

 https://github.com/macports/macports-ports/pull/11959

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Ticket URL: <https://trac.macports.org/ticket/62165#comment:28>
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