[SAC] [OSGeo] #2823: Upgrade osgeo6 to bullseye

[OSGeo]

#2823: Upgrade osgeo6 to bullseye
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 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2022-II
Component:  Systems Admin  |   Keywords:
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 osgeo6 is currently at buster.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2823>
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