flake.lock: Update
flake.lock: Update

Flake lock file changes:

• Updated input 'lowdown-src':
    'github:kristapsdz/lowdown/6bd668af3fd098bdd07a1bedd399564141e275da' (2021-09-24)
  → 'github:kristapsdz/lowdown/d2c2b44ff6c27b936ec27358a2653caaef8f73b8' (2021-10-06)

rycee/nix,NixOS/nix,NixOS/nix,rycee/nix,NixOS/nix,rycee/nix,rycee/nix,NixOS/nix,NixOS/nix,rycee/nix