flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/aaeaf4574767a0f5ed1787e990139aefcf4db103?narHash=sha256-iGb6ptUaNBOCftKnNJiWT5z1ftngfNtwqJkD8Z9Vwfw%3D' (2024-03-30)
  → 'github:nix-community/fenix/ca0a8350f4c278204475112dd600ba6f0d09110e?narHash=sha256-IUnCQ0xo0sJRhHbsXVDQ9ULpiQrkxbavmVOilhAXdlk%3D' (2024-08-10)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/f5a9250147f6569d8d89334dc9cca79c0322729f?narHash=sha256-dyezzeSbWMpflma%2BE9USmvSxuLgGcNGcGw3cOnX36ko%3D' (2024-03-29)
  → 'github:rust-lang/rust-analyzer/56f63dfd8aeebf80e3fc87894fa3d5a40f98a329?narHash=sha256-UdydOPxlUpEE%2BuparyCgxTCSumwCn2URpxPm70G1K%2BQ%3D' (2024-08-09)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/d8fe5e6c92d0d190646fb9f1056741a229980089?narHash=sha256-iMUFArF0WCatKK6RzfUJknjem0H9m4KgorO/p3Dopkk%3D' (2024-03-29)
  → 'github:nixos/nixpkgs/5e0ca22929f3342b19569b21b2f3462f053e497b?narHash=sha256-M0xJ3FbDUc4fRZ84dPGx5VvgFsOzds77KiBMW/mMTnI%3D' (2024-08-09)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/db12d0c6ef002f16998723b5dd619fa7b8997086?narHash=sha256-6eaaoJUkr4g9J/rMC4jhj3Gv8Sa62rvlpjFe3xZaSjM%3D' (2024-07-02)
  → 'github:oxalica/rust-overlay/615cfd85b4d9c51811a8d875374268fab5bd4089?narHash=sha256-9iDTrfVM%2Bmbcad31a47oqW8t8tfSA4C/si6F8F2DO/w%3D' (2024-08-10)