flake.lock: Update (#200)

Flake lock file updates:

• Updated input 'claude-code':
    'github:sadjow/claude-code-nix/f7bbe3a' (2026-05-21)
  → 'github:sadjow/claude-code-nix/9316db3' (2026-05-22)
• Updated input 'claude-code/nixpkgs':
    'github:NixOS/nixpkgs/d99b013' (2026-05-20)
  → 'github:NixOS/nixpkgs/6dedf69' (2026-05-22)
• Updated input 'niri':
    'github:sodiboo/niri-flake/f539bec' (2026-05-21)
  → 'github:sodiboo/niri-flake/1209504' (2026-05-22)
• Updated input 'niri/nixpkgs':
    'github:NixOS/nixpkgs/d233902' (2026-05-15)
  → 'github:NixOS/nixpkgs/f83fc3c' (2026-05-21)
• Updated input 'nixpkgs-unstable':
    'github:nixos/nixpkgs/d99b013' (2026-05-20)
  → 'github:nixos/nixpkgs/6dedf69' (2026-05-22)

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

Author: bottd