[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          |   Keywords:
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 - current installed version: 1.25.3
 (https://wiki.osgeo.org/wiki/Special:Version)
  - will also likely likely PHP and MySQL upgrades
  - must take care of extensions

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