flake.lock: Update (#4062)

* flake.lock: Update

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/bee6a7250dd1b01844a2de7e02e4df7d8a0a206c' (2022-06-24)
  → 'github:numtide/flake-utils/7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249' (2022-07-04)
• Updated input 'gitignore':
    'github:hercules-ci/gitignore.nix/bff2832ec341cf30acb3a4d3e2e7f1f7b590116a' (2022-03-05)
  → 'github:hercules-ci/gitignore.nix/f2ea0f8ff1bce948ccb6b893d15d5ea3efaf1364' (2022-07-21)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/6141b8932a5cf376fe18fcd368cecd9ad946cb68' (2022-06-23)
  → 'github:NixOS/nixpkgs/2d372784634e224c5a629d80a19705af655fbc7d' (2022-07-22)
• Updated input 'pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/db3bd555d3a3ceab208bed48f983ccaa6a71a25e' (2022-06-25)
  → 'github:cachix/pre-commit-hooks.nix/f436e6dbc10bb3500775785072a40eefe057b18e' (2022-07-23)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/59a3a304c987dc65d2a33de0a77a1ae6ae777cd4' (2022-06-25)
  → 'github:oxalica/rust-overlay/4bd340885e39e0625fc6dda8a5a9d13c921ebb96' (2022-07-23)

* Switch from vit to iog binary cache

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Rok Garbas <rok@garbas.si>