[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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Comment (by robe):

 On further inspection, I see the issue is they removed nginx from the
 image.

 https://github.com/pretalx/pretalx-
 docker/commit/702197a82d924d043dd8ac42cc9491387246d1ce
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3052#comment:18>
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