[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3967: update the nix package's pycddl dependency to 0.4

[Tahoe-LAFS]

#3967: update the nix package's pycddl dependency to 0.4
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 Reporter:  exarkun  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 There are some performance improvements to be had, the test suite is not
 happy with the current older version, and there's some backwards
 compatibility complexity that can be dropped by just requiring >= 0.4.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3967>
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