chore: update flake.lock

[mrcjkb]

Automated changes by the update-flake-lock GitHub Action.

Flake lock file updates:

• Updated input 'neovim-nightly':
    'github:neovim/neovim/684e93054b82c6b5b215db7d3ecbad803eb81f0e?dir=contrib' (2023-10-25)
  → 'github:neovim/neovim/9de157bce4b6eb055a0d7a39d1ed6b7a6e6c6545?dir=contrib' (2023-10-26)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/51d906d2341c9e866e48c2efcaac0f2d70bfd43e' (2023-10-21)
  → 'github:nixos/nixpkgs/75a52265bda7fd25e06e3a67dee3f0354e73243c' (2023-10-25)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/8cc349bfd082da8782b989cad2158c9ad5bd70fd' (2023-10-19)
  → 'github:cachix/pre-commit-hooks.nix/bd38df3d508dfcdff52cd243d297f218ed2257bf' (2023-10-25)

Running GitHub Actions on this PR

GitHub Actions will not run workflows on pull requests which are opened by a GitHub Action.

To run GitHub Actions workflows on this PR, run:

git branch -D update_flake_lock_action
git fetch origin
git checkout update_flake_lock_action
git commit --amend --no-edit
git push origin update_flake_lock_action --force