[MacPorts] #39514: py-libxml2: update to 2.9.1

[MacPorts]

#39514: py-libxml2: update to 2.9.1
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 Reporter:  jmr@…   |      Owner:  macports-tickets@…
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  py-libxml2
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 Should be updated to match libxml2 (r107249).

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Ticket URL: <https://trac.macports.org/ticket/39514>
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