deps: update flake.lock (#155)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/7d853e518814cca2a657b72eeba67ae20ebf7059?narHash=sha256-l/YGrEpLromL4viUo5GmFH3K5M1j0Mb9O%2BLiaeCPWEM%3D' (2025-12-19)
  → 'github:nixos/nixpkgs/3edc4a30ed3903fdf6f90c837f961fa6b49582d1?narHash=sha256-Ss/LHpJJsng8vz1Pe33RSGIWUOcqM1fjrehjUkdrWio%3D' (2025-12-27)

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

Author: mrcjkb