[MacPorts] #69900: graphviz, graphviz-devel: update to 12.x

[MacPorts]

#69900: graphviz, graphviz-devel: update to 12.x
---------------------------------------+----------------------
  Reporter:  mohd-akram                |      Owner:  mascguy
      Type:  update                    |     Status:  assigned
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:
Resolution:                            |   Keywords:
      Port:  graphviz, graphviz-devel  |
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Comment (by mascguy):

 `graphviz` updated to 12.2.1, via commit:
 [changeset:8959846de7d46f6463d3b15dfd00ecc3365954fd/macports-ports commit
 8959846d]

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Ticket URL: <https://trac.macports.org/ticket/69900#comment:4>
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