[MacPorts] #73964: pxlib: needs revbump for libxml2

[MacPorts]

#73964: pxlib: needs revbump for libxml2
--------------------------+--------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.12.5
 Keywords:                |       Port:  pxlib
--------------------------+--------------------
 `pxlib` is shown as broken after `libxml2` update. Not sure if it links
 opportunistically or portfile fails to declare a dependency.

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Ticket URL: <https://trac.macports.org/ticket/73964>
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