flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/4e7f1c7f11fb22d7954b2dacbe87c61548fab82d' -> 'github:NixOS/nix/edfd676e059578fb574ce78d1a2cc66d018d3b16'

Created by  Eelco Dolstra  on August 7, 2020
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