flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/81afc33397436c678482a1560bbc810cc3504dbc?narHash=sha256-NcfLaETnNMPHTlu7/oTrihCjTL6G2DIe6lHZ68o2n8w%3D' (2024-12-19)
  → 'github:nix-community/fenix/cc13ba51f1a3b8eaa4c03fbe46d029effbbcb3c1?narHash=sha256-JePC5P8YHoLkK7u%2B0gm0da3rUF3d/N4Qo1q2zvHdVxM%3D' (2024-12-26)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/27fac08c82210837a2ac84fa5e39eee6993f1605?narHash=sha256-IGe/elaXn5XXA62RIL9OuLMq1vgrUCm%2BbYPqYCZJ7Ug%3D' (2024-12-18)
  → 'github:rust-lang/rust-analyzer/bfc223e85742646f9c31d7b9a21c77db77d28c8e?narHash=sha256-Hw5Zc52RFf8arFrRya0yJYneqE4qG4loyfKVDWfIO%2BA%3D' (2024-12-25)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d3c42f187194c26d9f0309a8ecc469d6c878ce33?narHash=sha256-cHar1vqHOOyC7f1%2BtVycPoWTfKIaqkoe1Q6TnKzuti4%3D' (2024-12-17)
  → 'github:NixOS/nixpkgs/d70bd19e0a38ad4790d3913bf08fcbfc9eeca507?narHash=sha256-4EVBRhOjMDuGtMaofAIqzJbg4Ql7Ai0PSeuVZTHjyKQ%3D' (2024-12-19)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/573c674a3ad06e8a525263185ebef336a411d1d5?narHash=sha256-BxQ/4JuHEi0zRjF0P8B5xnbXOLulgsK2gfwVRXGZ4a4%3D' (2024-12-19)
  → 'github:oxalica/rust-overlay/550e1f10be4a504747a7894c35e887e61235763b?narHash=sha256-ceUDFBsLf5Cz3GlhQAdaJsEfi5s1MDjDsO9VvPFoKAE%3D' (2024-12-26)