message: Fix `audit` workflow
  ... since `nix` recently released a `0.22.3`, which is safe by default.
diff: @@ -11,6 +11,5 @@ jobs:
  - name: Manually update `nix` crates # See https://github.com/nix-rust/nix/issues/1627
  run: |
  cargo update --package nix:0.20.0 --precise 0.20.2
  - cargo update --package nix:0.22.0 --precise 0.22.2
  - name: Audit dependencies
  run: cargo audit
  