flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/144bb3ef7ddca6502ea3e1878f7fc0a3f9013aba' -> 'github:NixOS/nix/6529490cc10018d5191e50c482ac1180b96b1a3c'

Created by  Eelco Dolstra  on February 17, 2020
KW5WOJ7NNLK3J2FF3YXDVBKCZ2MCAPGGLSD6SWSR4C2JJ6UAX6UAC
Change contents