[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4127: Add CI for testing against Python 3.12

[Tahoe-LAFS]

#4127: Add CI for testing against Python 3.12
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 Reporter:  hacklschorsch  |          Owner:
     Type:  task           |         Status:  new
 Priority:  minor          |      Milestone:  undecided
Component:  unknown        |        Version:  n/a
 Keywords:                 |  Launchpad Bug:
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 The already fixed ticket:4071 added Python 3.12 compatibility, but we
 don't test regularly in our CI.

 Add a CI job testing Python 3.12.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4127>
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