flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/5e6eabe1551f3fa2a463fced39a4a48b504ed1ab' -> 'github:NixOS/nix/79aa7d95183cbe6c0d786965f0dbff414fd1aa67'

Created by  Eelco Dolstra  on November 19, 2020
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