flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/eb19ff3b82240326fc0e999e09f81b6c8ed98640' -> 'github:NixOS/nix/144bb3ef7ddca6502ea3e1878f7fc0a3f9013aba'

Created by  Eelco Dolstra  on February 15, 2020
XKUCKKZ5EBDVWNXCVBAZR2UOL4EDW3NO36YBH6CHAYARBZAEESOAC
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