flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/4e96537f163fad24ed9eb317798a79afc85b51b7?narHash=sha256-GFzPxJzTd1rPIVD4IW%2BGwJlyGwBDV1Tj5FLYwDQQ9sM%3D' (2025-01-26)
  → 'github:NixOS/nixpkgs/2b4230bf03deb33103947e2528cac2ed516c5c89?narHash=sha256-BPHmb3fUwdHkonHyHi1%2Bx89eXB3kA1jffIpwPVJIVys%3D' (2025-01-28)
• Updated input 'nixpkgs-darwin':
    'github:NixOS/nixpkgs/e7d1ad8950c9c4d3f17626b5a44965b26ca1a44a?narHash=sha256-AFirXjuOH227NzuDeVn%2BgLsTkSGjo0Ve2oPR1JA8fjU%3D' (2025-01-27)
  → 'github:NixOS/nixpkgs/a6fb7237cd4b325a8a75e0eab9e43caa94fcd3f1?narHash=sha256-ROPyVvAP9oK0fUdA3PRtYP4d3yfU4z7/7Nq7BasqTqs%3D' (2025-01-28)
• Updated input 'nixpkgs-unstable':
    'github:NixOS/nixpkgs/88a55dffa4d44d294c74c298daf75824dc0aafb5?narHash=sha256-8Eo/jRAgT3CbAloyqOj6uPN1EqBvLI/Tv2g%2BRxHjkhU%3D' (2025-01-27)
  → 'github:NixOS/nixpkgs/9a5db3142ce450045840cc8d832b13b8a2018e0c?narHash=sha256-pUvLijVGARw4u793APze3j6mU1Zwdtz7hGkGGkD87qw%3D' (2025-01-29)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/f2cc121df15418d028a59c9737d38e3a90fbaf8f?narHash=sha256-5An1wq5U8sNycOBBg3nsDDgpwBmR9liOpDGlhliA6Xo%3D' (2025-01-21)
  → 'github:numtide/treefmt-nix/bebf27d00f7d10ba75332a0541ac43676985dea3?narHash=sha256-j6jC12vCFsTGDmY2u1H12lMr62fnclNjuCtAdF1a4Nk%3D' (2025-01-28)