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/bcbb8d5046d6ca9e35eb54f4d36f303ac9bd89e8?narHash=sha256-XCmys9ELmm1w3%2BvDhoO9CQOS3/qBY4D1VzFnDpC8uPQ%3D' (2025-01-06)
• 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/6725e046df7493c1047e115ebc7180fb06416038?narHash=sha256-5P%2BkK7S64/Mg8NrGQ3ScqoRW7vJAKzoeGJCFhEbldN0%3D' (2025-01-04)
• Updated input 'flake-parts':
    'github:hercules-ci/flake-parts/205b12d8b7cd4802fbcb8e8ef6a0f1408781a4f9?narHash=sha256-4pDvzqnegAfRkPwO3wmwBhVi/Sye1mzps0zHWYnP88c%3D' (2024-12-04)
  → 'github:hercules-ci/flake-parts/b905f6fc23a9051a6e1b741e1438dbfc0634c6de?narHash=sha256-%2Bhu54pAoLDEZT9pjHlqL9DNzWz0NbUn8NEAHP7PQPzU%3D' (2025-01-06)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/d3c42f187194c26d9f0309a8ecc469d6c878ce33?narHash=sha256-cHar1vqHOOyC7f1%2BtVycPoWTfKIaqkoe1Q6TnKzuti4%3D' (2024-12-17)
  → 'github:NixOS/nixpkgs/8f3e1f807051e32d8c95cd12b9b421623850a34d?narHash=sha256-/qlNWm/IEVVH7GfgAIyP6EsVZI6zjAx1cV5zNyrs%2BrI%3D' (2025-01-04)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/573c674a3ad06e8a525263185ebef336a411d1d5?narHash=sha256-BxQ/4JuHEi0zRjF0P8B5xnbXOLulgsK2gfwVRXGZ4a4%3D' (2024-12-19)
  → 'github:oxalica/rust-overlay/2f5d4d9cd31cc02c36e51cb2e21c4b25c4f78c52?narHash=sha256-z%2BWGez9oTR2OsiUWE5ZhIpETqM1ogrv6Xcd24WFi6KQ%3D' (2025-01-06)