flake.lock: Update

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/1ed9fb1935d260de5fe1c2f7ee0ebaae17ed2fa1' (2022-05-30)
  → 'github:numtide/flake-utils/c0e246b9b83f637f4681389ecabcb2681b4f3af0' (2022-08-07)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/90cd5459a1fd707819b9a3fb9c852beaaac3b79a' (2022-06-11)
  → 'github:nixos/nixpkgs/e105167e98817ba9fe079c6c3c544c6ef188e276' (2022-08-13)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/e04a88d7f859ae9ec42267866bb68c1a741e6859' (2022-06-12)
  → 'github:oxalica/rust-overlay/911a6600b6c099204cea817e59291a943705831e' (2022-08-14)
• Updated input 'rust-overlay/flake-utils':
    'github:numtide/flake-utils/bba5dcc8e0b20ab664967ad83d24d64cb64ec4f4' (2021-11-15)
  → 'github:numtide/flake-utils/7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249' (2022-07-04)
• Updated input 'rust-overlay/nixpkgs':
    'github:NixOS/nixpkgs/8afc4e543663ca0a6a4f496262cd05233737e732' (2021-11-21)
  → 'github:NixOS/nixpkgs/11b60e4f80d87794a2a4a8a256391b37c59a1ea7' (2022-07-29)