flake.lock: Update (#308)

Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/e4e78a2cbeaddd07ab7238971b16468cc1d14daf?narHash=sha256-GKgwu5//R%2BcLdKysZjGqvUEEOGXXLdt93sNXeb2M/Lk%3D' (2025-12-30)
  → 'github:nix-community/home-manager/a65c04965c841eb01ba401f5162f12bc8d52014f?narHash=sha256-N0kK1JqxIjFl7hPAfhkW6C9AO7feYJUWLPyqJO2VuQQ%3D' (2026-01-05)
• Updated input 'nixos-pibox':
    'github:ipetkov/nixos-pibox/3e72ce2ba57871d9da794abf1f0d5d67b6ea3333?narHash=sha256-IqR0t4%2BH/Ktgt//KkNC2kT0gVN3vxsKEgRVVTKh3jfc%3D' (2025-12-03)
  → 'github:ipetkov/nixos-pibox/2bcba998afde6ddb71f0a1a54abddd0ba338d342?narHash=sha256-03AjXaGAAY/NCARWgJobKavKsuXDwvcCENTtELaCuOI%3D' (2026-01-03)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/cad22e7d996aea55ecab064e84834289143e44a0?narHash=sha256-5vKw92l1GyTnjoLzEagJy5V5mDFck72LiQWZSOnSicw%3D' (2025-12-30)
  → 'github:NixOS/nixpkgs/fb7944c166a3b630f177938e478f0378e64ce108?narHash=sha256-EgE0pxsrW9jp9YFMkHL9JMXxcqi/OoumPJYwf%2BOkucw%3D' (2026-01-02)

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

Author: ipetkov