[SAC] [OSGeo] #2988: Upgrade matrix to bullseye

[OSGeo]

#2988: Upgrade matrix to bullseye
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 Reporter:  strk           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2023-I
Component:  Systems Admin  |   Keywords:
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 That container (in osgeo3) is currently at Buster

 See also #2822 and #2823
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2988>
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