flake.lock: Update (#95)

Flake lock file updates:

• Updated input 'flake-compat':
    'github:edolstra/flake-compat/4f910c9827911b1ec2bf26b5a062cd09f8d89f85' (2023-10-02)
  → 'github:edolstra/flake-compat/0f9255e01c2351cc7d116c072cb317785dd33b33' (2023-10-04)
• Updated input 'neovim-nightly':
    'github:neovim/neovim/1e7e9ee91f73c62b8c5ba9dbdabba3a3b6dc0130?dir=contrib' (2023-10-03)
  → 'github:neovim/neovim/5f4f83ba322d2642d485669ecf762b629241d9dc?dir=contrib' (2023-10-04)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/0c7ffbc66e6d78c50c38e717ec91a2a14e0622fb' (2023-10-02)
  → 'github:nixos/nixpkgs/7131f3c223a2d799568e4b278380cd9dac2b8579' (2023-10-04)

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