flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/dfaf3a97fe595a18bf9d55cda3416c17fe906f0f' (2023-11-08)
  → 'github:nix-community/fenix/f70eee0e38bc2287687c853df9b4ed6f6a028eb0' (2024-03-02)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/3b7c7f97e4a7bb253a8d398ee4f8346f6cf2817b' (2023-11-07)
  → 'github:rust-lang/rust-analyzer/79e0fee6a30a5f563e9b709cc5959694709e19c4' (2024-03-01)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/ec750fd01963ab6b20ee1f0cb488754e8036d89d' (2023-11-07)
  → 'github:NixOS/nixpkgs/458b097d81f90275b3fdf03796f0563844926708' (2024-03-02)
• Updated input 'utils':
    'github:numtide/flake-utils/ff7b65b44d01cf9ba6a71320833626af21126384' (2023-09-12)
  → 'github:numtide/flake-utils/d465f4819400de7c8d874d50b982301f28a84605' (2024-02-28)