flake.lock: Update

Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/ff5e5d8' (2026-02-14)
  → 'github:nix-community/home-manager/5bd3589' (2026-02-22)
• Updated input 'nix-darwin':
    'github:nix-darwin/nix-darwin/6c5a562' (2026-02-12)
  → 'github:nix-darwin/nix-darwin/6a7fdcd' (2026-02-19)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/a82ccc3' (2026-02-13)
  → 'github:nixos/nixpkgs/0182a36' (2026-02-17)

Author: github-actions[bot]