flake.lock: Update (#266)

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/eb683549b7d76b12d1a009f888b91b70ed34485f' (2024-01-27)
  → 'github:nix-community/fenix/28dbd8b43ea328ee708f7da538c63e03d5ed93c8' (2024-02-03)
• Updated input 'fenix/nixpkgs':
    'github:nixos/nixpkgs/ae5c332cbb5827f6b1f02572496b141021de335f' (2024-01-25)
  → 'github:nixos/nixpkgs/b8b232ae7b8b144397fdb12d20f592e5e7c1a64d' (2024-01-31)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/596e5c77cf5b2b660b3ac2ce732fa0596c246d9b' (2024-01-26)
  → 'github:rust-lang/rust-analyzer/8f6a72871ec87ed53cfe43a09fb284168a284e7e' (2024-02-02)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/a93f891e7511780bd9172e69db574242acc79043' (2024-01-27)
  → 'github:NixOS/nixpkgs/c96ce5eae6b43ae999a8df54a097326a9899f896' (2024-02-03)
• Updated input 'nixpkgs-master':
    'github:NixOS/nixpkgs/ad4177303969f450b7340c8148b2878f42dc46c1' (2024-01-28)
  → 'github:NixOS/nixpkgs/61ef96ff0057ec7e8f073dd45ab31b4b7648002b' (2024-02-03)