flake.lock: Update (#93)

Flake lock file updates:

• Updated input 'flake-compat':
    'github:edolstra/flake-compat/35bb57c0c8d8b62bbfd284272c928ceb64ddbde9' (2023-01-17)
  → 'github:edolstra/flake-compat/4f910c9827911b1ec2bf26b5a062cd09f8d89f85' (2023-10-02)
• Updated input 'neovim-nightly':
    'github:neovim/neovim/09a17f91d0d362c6e58bfdbe3ccdeacffb0b44b9?dir=contrib' (2023-10-02)
  → 'github:neovim/neovim/3af59a415c98afc42755308e56912b302ad5eb3d?dir=contrib' (2023-10-03)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/0396d3b0fb7f62ddc79a506ad3e6124f01d2ed0a' (2023-10-01)
  → 'github:nixos/nixpkgs/f902cb49892d300ff15cb237e48aa1cad79d68c3' (2023-10-02)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>