flake.lock: Update (#320)

Flake lock file updates:

• Updated input 'home-manager':
    'github:nix-community/home-manager/be0c641a6a5564caa33982faa1fe2c60d92131c7?narHash=sha256-FFMc1uAwy2GYasd0rdNDVxKyAgzuoJH2M%2BGglBQbqf0%3D' (2026-03-13)
  → 'github:nix-community/home-manager/9670de2921812bc4e0452f6e3efd8c859696c183?narHash=sha256-FOnZjElEI8pqqCvB6K/1JRHTE8o4rer8driivTpq2uo%3D' (2026-03-20)
• Updated input 'nixos-hardware':
    'github:NixOS/nixos-hardware/3966ce987e1a9a164205ac8259a5fe8a64528f72?narHash=sha256-mUJxsNOrBMNOUJzN0pfdVJ1r2pxeqm9gI/yIKXzVVbk%3D' (2026-03-08)
  → 'github:NixOS/nixos-hardware/2d4b4717b2534fad5c715968c1cece04a172b365?narHash=sha256-HHYEwK1A22aSaxv2ibhMMkKvrDGKGlA/qObG4smrSqc%3D' (2026-03-20)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/fe416aaedd397cacb33a610b33d60ff2b431b127?narHash=sha256-b/GV2ysM8mKHhinse2wz%2BuP37epUrSE%2BsAKXy/xvBY4%3D' (2026-03-12)
  → 'github:NixOS/nixpkgs/b40629efe5d6ec48dd1efba650c797ddbd39ace0?narHash=sha256-TJ3lSQtW0E2JrznGVm8hOQGVpXjJyXY2guAxku2O9A4%3D' (2026-03-18)

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

Author: ipetkov