chore(update): Update flake.lock

[VolodiaPG]

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

Flake lock file updates:

• Updated input 'nixvim':
    'github:nix-community/nixvim/35d6c12626f9895cd5d8ccf5d19c3d00de394334?narHash=sha256-5YAiZ3wrEJ/fzFoCwNf14xqfRTvgdcnl/%2By0vye3Y6A%3D' (2025-01-12)
  → 'github:nix-community/nixvim/a54b752259ff16d340d270928ee603b4b9599192?narHash=sha256-dXvzw4LmupgZb2VfwclzygiIyfqjnmKhTdjHDun2rDg%3D' (2025-01-13)

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