flake.lock: Update

Flake lock file updates:

• Updated input 'buildbot-nix':
    'github:nix-community/buildbot-nix/0239dd9' (2026-03-22)
  → 'github:nix-community/buildbot-nix/19a89fd' (2026-04-05)
• Updated input 'buildbot-nix/flake-parts':
    'github:hercules-ci/flake-parts/f20dc5d' (2026-03-01)
  → 'github:hercules-ci/flake-parts/3107b77' (2026-04-01)
• Updated input 'buildbot-nix/hercules-ci-effects':
    'github:hercules-ci/hercules-ci-effects/0b152e0' (2026-02-15)
  → 'github:hercules-ci/hercules-ci-effects/554f6ed' (2026-03-15)
• Updated input 'buildbot-nix/treefmt-nix':
    'github:numtide/treefmt-nix/71b125c' (2026-03-12)
  → 'github:numtide/treefmt-nix/7592596' (2026-04-02)
• Updated input 'darwin':
    'github:lnl7/nix-darwin/da529ac' (2026-03-08)
  → 'github:lnl7/nix-darwin/06648f4' (2026-04-01)
• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/f20dc5d' (2026-03-01)
  → 'github:hercules-ci/flake-parts/3107b77' (2026-04-01)
• Updated input 'flake-parts/nixpkgs-lib':
    'github:nix-community/nixpkgs.lib/c185c7a' (2026-03-01)
  → 'github:nix-community/nixpkgs.lib/333c4e0' (2026-03-29)
• Updated input 'nix-packages':
    'github:devusb/nix-packages/b013652' (2026-03-28)
  → 'github:devusb/nix-packages/6acf432' (2026-04-07)
• Updated input 'nix-packages/flake-parts':
    'github:hercules-ci/flake-parts/f20dc5d' (2026-03-01)
  → 'github:hercules-ci/flake-parts/3107b77' (2026-04-01)
• Updated input 'nix-packages/flake-parts/nixpkgs-lib':
    'github:nix-community/nixpkgs.lib/c185c7a' (2026-03-01)
  → 'github:nix-community/nixpkgs.lib/333c4e0' (2026-03-29)
• Updated input 'nix-packages/treefmt-nix':
    'github:numtide/treefmt-nix/71b125c' (2026-03-12)
  → 'github:numtide/treefmt-nix/7592596' (2026-04-02)
• Updated input 'nixos-apple-silicon':
    'github:nix-community/nixos-apple-silicon/9fe29a6' (2026-03-23)
  → 'github:nix-community/nixos-apple-silicon/b6d1d07' (2026-04-11)
• Updated input 'nixos-hardware':
    'github:NixOS/nixos-hardware/3f6f874' (2026-03-26)
  → 'github:NixOS/nixos-hardware/c775c27' (2026-04-06)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/46db2e0' (2026-03-24)
  → 'github:NixOS/nixpkgs/4c1018d' (2026-04-09)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/614e256' (2026-03-23)
  → 'github:Mic92/sops-nix/d2e8438' (2026-04-08)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/71b125c' (2026-03-12)
  → 'github:numtide/treefmt-nix/790751f' (2026-04-08)

Author: github-actions[bot]