[MacPorts] #39454: libxml2: update to 2.9.1

[MacPorts]

#39454: libxml2: update to 2.9.1
--------------------------+----------------------------
 Reporter:  ryandesign@…  |      Owner:  cedric.luthi@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  libxml2
--------------------------+----------------------------
 {{{
 $ port livecheck libxml2
 libxml2 seems to have been updated (port version: 2.9.0, new version:
 2.9.1)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/39454>
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