[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:  reopened
 Priority:  normal    |   Milestone:  Sysadmin Contract 2024-I
Component:  SysAdmin  |  Resolution:
 Keywords:            |
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Changes (by robe):

 * status:  closed => reopened
 * resolution:  fixed =>

Comment:

 Oops just noticed an issue, the media is not showing like images of people
 and css.

 e.g.

 https://talks.osgeo.org/foss4g-2023/talk/XBHYF9/

 Going to check what's wrong there.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3052#comment:7>
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