flake.lock: Update

Flake lock file updates:

• Updated input 'CHaP':
    'github:input-output-hk/cardano-haskell-packages/550ea1a' (2025-05-16)
  → 'github:input-output-hk/cardano-haskell-packages/589f02e' (2026-01-08)
• Updated input 'hackage-nix':
    'github:input-output-hk/hackage.nix/d1a38eb' (2025-10-01)
  → 'github:input-output-hk/hackage.nix/3111442' (2026-01-11)

Author: github-actions[bot]