flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/d2032edb2f86e955a8a7724a27c0c3225f386500' -> 'github:NixOS/nix/eb19ff3b82240326fc0e999e09f81b6c8ed98640'

Created by  Eelco Dolstra  on February 14, 2020
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