flake.lock: Update

Flake input changes:

  • Updated 'nix': 'github:NixOS/nix/d9864be4b757468d33bc49edddce5e4f04ef4b90' -> 'github:NixOS/nix/a6ba313a0aac3b6e2fef434cb42d190a0849238e'
  • Added 'nix/lowdown-src': 'github:kristapsdz/lowdown/148f9b2f586c41b7e36e73009db43ea68c7a1a4d'
  • Updated 'nix/nixpkgs': 'github:NixOS/nixpkgs/0e499fde7af3c28d63e9b13636716b86c3162b93' -> 'github:NixOS/nixpkgs/f77036342e2b690c61c97202bf48f2ce13acc022'

Created by  Eelco Dolstra  on August 10, 2021
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