Loosen version constraints to not have an upper bound. The upper bounds would have to be updated again on the next keyring update, so they don't make sense.
The requirement's constraint for `pythonPackages.keyring` didn't allow keyring v11. However it has been bumped in 93a16a2ace by @FRidh. Current failure: https://nix-cache.s3.amazonaws.com/log/2nw5adfx86jwiax32mn11kqpc35xwhsh-bonfire-unstable-2017-01-19.drv See ticket #36453
93a16a2ace