flake.lock: Update

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/ff7b65b44d01cf9ba6a71320833626af21126384' (2023-09-12)
  → 'github:numtide/flake-utils/4022d587cbbfd70fe950c1e2083a02621806a725' (2023-12-04)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/886c9aee6ca9324e127f9c2c4e6f68c2641c8256' (2023-12-18)
  → 'github:NixOS/nixpkgs/d44d59d2b5bd694cd9d996fd8c51d03e3e9ba7f7' (2023-12-31)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/20fd62b0891707a1db8117d09fc3e65a1cd0f6d7' (2023-12-19)
  → 'github:oxalica/rust-overlay/a0df72e106322b67e9c6e591fe870380bd0da0d5' (2024-01-01)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/e19071f9958c8da4f4347d3d78790d97e98ba22f' (2023-12-02)
  → 'github:Mic92/sops-nix/cfdbaf68d00bc2f9e071f17ae77be4b27ff72fa6' (2023-12-31)
• Updated input 'sops-nix/nixpkgs-stable':
    'github:NixOS/nixpkgs/dfb95385d21475da10b63da74ae96d89ab352431' (2023-11-25)
  → 'github:NixOS/nixpkgs/0aad9113182747452dbfc68b93c86e168811fa6c' (2023-12-30)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/e82f32aa7f06bbbd56d7b12186d555223dc399d1' (2023-11-12)
  → 'github:numtide/treefmt-nix/e434da615ef74187ba003b529cc72f425f5d941e' (2024-01-02)