[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3889: update nix packaging to latest nixos 21.11 / pypi db

[Tahoe-LAFS]

#3889: update nix packaging to latest nixos 21.11 / pypi db
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     Reporter:  exarkun  |      Owner:
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:  undecided
    Component:  unknown  |    Version:  n/a
   Resolution:           |   Keywords:  review
Launchpad Bug:           |
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Comment (by exarkun):

 Actually, I forgot, we use zfec from pypi too.  So the pypi db update is
 really what gets us both of these things and the nixpkgs update is more
 about using the latest version of the release instead of a randomly old
 version.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3889#comment:2>
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