flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/3e7aab81ce6787e01ea4ced5af1fc6a84e523762' -> 'github:NixOS/nix/3aaceeb7e2d3fb8a07a1aa5a21df1dca6bbaa0ef'
  • Updated 'nixpkgs': 'github:NixOS/nixpkgs/b0c285807d6a9f1b7562ec417c24fa1a30ecc31a' -> 'github:NixOS/nixpkgs/29eddfc36d720dcc4822581175217543b387b1e8'

Created by  Eelco Dolstra  on April 9, 2020
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