[OSGeo] #3052: Upgrade pretalx to latest version

[OSGeo]

#3052: Upgrade pretalx to latest version
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 Reporter:  robe      |       Owner:  sac@…
     Type:  task      |      Status:  new
 Priority:  normal    |   Milestone:  Sysadmin Contract 2023-I
Component:  SysAdmin  |  Resolution:
 Keywords:            |
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Comment (by lucadelu):

 Thanks Robe to look on it, pretalx-pages plugin is not really important,
 instead we need public-voting one.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3052#comment:2>
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