[SAC] [OSGeo] #2174: Upgrade Mailman version to recent 2.1.27 release

[OSGeo]

#2174: Upgrade Mailman version to recent 2.1.27 release
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 Reporter:  Jeff McKenna   |       Owner:  strk
     Type:  task           |      Status:  assigned
 Priority:  normal         |   Milestone:  Sysadmin Contract 2020-II
Component:  Systems Admin  |  Resolution:
 Keywords:  mailman        |
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Comment (by strk):

 There's no upgrade in apt repos for the current version
 of Debian on that machine (8), so we're left to these choicese:

   1. Find another .deb which works on that version of Debian
   2. Build another .deb which works on that version of Debian
   3. Stop using apt and move to manually built Mailman
   4. Upgrade Debian to latest (but will still not get us the .30
      version of Mailman)

 I tend to think 3 would be the best choice

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2174#comment:6>
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