flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/ed52cf632bf9db90311014600ca0f042ef57ca20' -> 'github:NixOS/nix/4e7f1c7f11fb22d7954b2dacbe87c61548fab82d'

Created by  Eelco Dolstra  on August 4, 2020
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