flake.lock: Update (#417)

Flake lock file updates:

• Updated input 'darwin':
    'github:lnl7/nix-darwin/5176e2f' (2026-04-01)
  → 'github:lnl7/nix-darwin/06648f4' (2026-04-01)
• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/f20dc5d' (2026-03-01)
  → 'github:hercules-ci/flake-parts/3107b77' (2026-04-01)
• Updated input 'flake-parts/nixpkgs-lib':
    'github:nix-community/nixpkgs.lib/c185c7a' (2026-03-01)
  → 'github:nix-community/nixpkgs.lib/333c4e0' (2026-03-29)
• Updated input 'git-hooks':
    'github:cachix/git-hooks.nix/c06f90f' (2026-03-31)
  → 'github:cachix/git-hooks.nix/580633f' (2026-04-07)
• Updated input 'home-manager':
    'github:nix-community/home-manager/f2d3e04' (2026-03-31)
  → 'github:nix-community/home-manager/7ba4ee4' (2026-04-08)
• Updated input 'nh':
    'github:nix-community/nh/093ff1f' (2026-04-04)
  → 'github:nix-community/nh/9c94e54' (2026-04-08)
• Updated input 'nix-index-database':
    'github:Mic92/nix-index-database/bc13aea' (2026-03-29)
  → 'github:Mic92/nix-index-database/cef5cf8' (2026-04-05)
• Updated input 'nixos-hardware':
    'github:nixos/nixos-hardware/f4c4c2c' (2026-03-31)
  → 'github:nixos/nixos-hardware/c775c27' (2026-04-06)
• Updated input 'nixos-unstable':
    'github:nixos/nixpkgs/8110df5' (2026-03-28)
  → 'github:nixos/nixpkgs/68d8aa3' (2026-04-05)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/19bf3d8' (2026-03-30)
  → 'github:Mic92/sops-nix/d2e8438' (2026-04-08)
• Updated input 'stable':
    'github:nixos/nixpkgs/107cba9' (2026-03-29)
  → 'github:nixos/nixpkgs/4e92bbc' (2026-04-07)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/71b125c' (2026-03-12)
  → 'github:numtide/treefmt-nix/790751f' (2026-04-08)
• Updated input 'unstable':
    'github:nixos/nixpkgs/15c6719' (2026-03-30)
  → 'github:nixos/nixpkgs/456e8a9' (2026-04-08)

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

Author: kclejeune