flake.lock: Update

Flake lock file updates:

• Updated input 'fenix':
    'github:nix-community/fenix/344945339ec0e01c62195b849ae8a67eaa1004a3?narHash=sha256-y0FYxyHd45FQkl1S4PIq9eNaEe2tEemHpQ3sp%2BC19Pk%3D' (2024-08-11)
  → 'github:nix-community/fenix/2d808ed09caffa0984a6d54bc1558959d48b012b?narHash=sha256-CgAGpxcTUwkbA2pjjnpLclSKI/DYZ55B8uPmwoXCorI%3D' (2024-08-29)
• Updated input 'fenix/rust-analyzer-src':
    'github:rust-lang/rust-analyzer/0daeb5c0b05cfdf2101b0f078c27539099bf38e6?narHash=sha256-xAxVDxuvCs8WWkrxVWjCiqxTkHhGj7sSppr1YMuEdT8%3D' (2024-08-10)
  → 'github:rust-lang/rust-analyzer/f454ea877180f0fd8d53390a1d9e6bdd6047b35d?narHash=sha256-k6WsRPDn%2BmZ67Aggh6miUZdGvDmbqlI%2BN1PJ%2Bhi3znw%3D' (2024-08-28)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/5e0ca22929f3342b19569b21b2f3462f053e497b?narHash=sha256-M0xJ3FbDUc4fRZ84dPGx5VvgFsOzds77KiBMW/mMTnI%3D' (2024-08-09)
  → 'github:NixOS/nixpkgs/71e91c409d1e654808b2621f28a327acfdad8dc2?narHash=sha256-GnR7/ibgIH1vhoy8cYdmXE6iyZqKqFxQSVkFgosBh6w%3D' (2024-08-28)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/ed4fe9af3814694d59c572649e881a6aa6eba533?narHash=sha256-oS8Qhpo71B/6OOsuVBFJbems7RKD/5e3TN2AdXhwMjg%3D' (2024-08-11)
  → 'github:oxalica/rust-overlay/0bc2c784e3a6ce30a2ab1b9f47325ccbed13039f?narHash=sha256-4yMO9%2BLsr3zqTf4clAGGag/bfNTmc/ITOXbJQcOEok4%3D' (2024-08-29)