flake.lock: Update

Flake lock file updates:

• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/f7b3c975cf067e56e7cda6cb098ebe3fb4d74ca2' (2024-03-01)
  → 'github:hercules-ci/flake-parts/9126214d0a59633752a136528f5f3b9aa8565b7d' (2024-04-01)
• Updated input 'flake-parts/nixpkgs-lib':
    'github:NixOS/nixpkgs/1536926ef5621b09bba54035ae2bb6d806d72ac8?dir=lib' (2024-02-29)
  → 'github:NixOS/nixpkgs/d8fe5e6c92d0d190646fb9f1056741a229980089?dir=lib' (2024-03-29)
• Updated input 'haskell-flake':
    'github:srid/haskell-flake/51bcbc27194e734a1524ac3d36e1539fba9a3baa' (2024-03-29)
  → 'github:srid/haskell-flake/d9dbdd466afbda9df75b49e50a01f5ade61d42bc' (2024-04-03)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/9b09bde6e3fc9493b6a8b2a5702ac87c66505c64' (2024-03-29)
  → 'github:nixos/nixpkgs/080a4a27f206d07724b88da096e27ef63401a504' (2024-04-02)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/c2172ef83d6904cdff3118e0c08e89171db6028a' (2024-03-27)
  → 'github:numtide/treefmt-nix/49dc4a92b02b8e68798abd99184f228243b6e3ac' (2024-04-01)