Keybase updates

[np]

keybase: 1.0.20 -> 1.0.22
keybase-gui: 1.0.23-20170519175207.d6c5e9e -> 1.0.25-20170714172717.73f9070
kbfs: 20170209.d1db463 -> 20170429.44efa06

Motivation for this change

This was outdated and now the three packages are working at the same time (didn't work for me before).

Things done

• Tested using sandboxing
  (nix.useSandbox on NixOS,
  or option build-use-sandbox in nix.conf
  on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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[mention-bot]

@np, thanks for your PR! By analyzing the history of the files in this pull request, we identified @SuprDewd, @peterhoeg and @bennofs to be potential reviewers.