flake.lock: Update

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/d465f4819400de7c8d874d50b982301f28a84605' (2024-02-28)
  → 'github:numtide/flake-utils/b1d9ab70662946ef0850d488da1c9019f3a9752a' (2024-03-11)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/9df3e30ce24fd28c7b3e2de0d986769db5d6225d' (2024-03-06)
  → 'github:nixos/nixpkgs/d691274a972b3165335d261cc4671335f5c67de9' (2024-03-14)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/d3a05d053b145349b8ad395741c5951f332280ef' (2024-03-09)
  → 'github:oxalica/rust-overlay/42baa9e2e4713572d7481f917243b07dffdf54b8' (2024-03-16)