[SAC] [OSGeo] #2004: Upgrade MediaWiki version

[OSGeo]

#2004: Upgrade MediaWiki version
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 Reporter:  Jeff McKenna  |       Owner:  sac@…
     Type:  task          |      Status:  new
 Priority:  major         |   Milestone:
Component:  Wiki          |  Resolution:
 Keywords:                |
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Comment (by strk):

 More reasons to upgrade are written in #1819, which I'm closing in favour
 of this newer one.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2004#comment:8>
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