flake.lock: Update

Flake lock file updates:

• Updated input 'neorocks-nix':
    'github:mrcjkb/neorocks-nix/fc029565ca5ba3a2a2fb1cd2a47c82a153ffce61' (2024-02-17)
  → 'github:mrcjkb/neorocks-nix/e57735d3ca397eccf1954fb4cd5869e1beec7057' (2024-02-18)
• Updated input 'neorocks-nix/neovim-nightly':
    'github:neovim/neovim/848fc8ede84b9cfc4e651e0e3b449060a8a8d70c?dir=contrib' (2024-02-17)
  → 'github:neovim/neovim/b12d193b4a68242fb0c7e4f924c8abce3488e1c8?dir=contrib' (2024-02-17)
• Updated input 'neorocks-nix/nixpkgs':
    'github:nixos/nixpkgs/c7763249f02b7786b4ca36e13a4d7365cfba162f' (2024-02-16)
  → 'github:nixos/nixpkgs/6e2f00c83911461438301db0dba5281197fe4b3a' (2024-02-17)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/c7763249f02b7786b4ca36e13a4d7365cfba162f' (2024-02-16)
  → 'github:nixos/nixpkgs/6e2f00c83911461438301db0dba5281197fe4b3a' (2024-02-17)