[MacPorts] #68885: libxml2: update to 2.12.3

[MacPorts]

#68885: libxml2: update to 2.12.3
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  Reporter:  mohd-akram  |      Owner:  ryandesign
      Type:  update      |     Status:  accepted
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  libxml2     |
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Comment (by szhorvat):

 FYI the new release of igraph (now in MacPorts) is compatible with libxml2
 2.12.x (previous versions weren't). So you don't need to check that port,
 Ryan. I hope this information makes the update easier.

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Ticket URL: <https://trac.macports.org/ticket/68885#comment:2>
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