[MacPorts] #38388: libxml2: update to 2.9.0

[MacPorts]

#38388: libxml2: update to 2.9.0
---------------------------------+----------------------------
  Reporter:  ryandesign@…        |      Owner:  cedric.luthi@…
      Type:  update              |     Status:  new
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:
      Port:  libxml2 py-libxml2  |
---------------------------------+----------------------------

Comment (by egall@…):

 {{{
 Local-Admins-MacBook-Pro:my_dotfiles ericgallager$ port dependents libxml2
 | wc -l
      126
 }}}
 {{{
 Local-Admins-MacBook-Pro:my_dotfiles ericgallager$ port rdependents
 libxml2 | wc -l
     1320
 }}}
 ...looks like a lot of stuff is going to need to be revbumped...

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Ticket URL: <https://trac.macports.org/ticket/38388#comment:3>
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