[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):

 P.S. I was thinking it was the introduction of the
 GUNICORN_FORWARDED_ALLOW_IPS cause that would explain why it works in
 debug and not production, but setting that didn't seem to make a
 difference
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3052#comment:15>
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