flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/2a8017092025a7c108ca1a829a8b4f0bcf7ee2c0' -> 'github:NixOS/nix/8b4a542d1767e0df7b3c0902b766f34352cb0958'
  • Updated 'nix/lowdown-src': 'github:edolstra/lowdown/c7a4e715af1e233080842db82d15b261cb74cb28' -> 'github:kristapsdz/lowdown/1705b4a26fbf065d9574dce47a94e8c7c79e052f'
  • Updated 'nixpkgs': 'github:NixOS/nixpkgs/252bfe0107587d40092057f338e9ffcf7bbd90cb' -> 'github:NixOS/nixpkgs/5659cb448e9b615d642c5fe52779c2223e72f7eb'

Created by  Maximilian Bosch  on September 26, 2020
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