check-by-name: Fix CI

Wasn't detected in https://github.com/NixOS/nixpkgs/pull/281407

.github/workflows/check-by-name.yml

@@ -94,7 +94,7 @@ jobs:
       - name: Fetching the pinned tool
         run: |
           # Get the direct /nix/store path from the pin to avoid having to evaluate Nixpkgs
-          toolPath=$(jq -r .ci-path pkgs/test/nixpkgs-check-by-name/scripts/pinned-tool.json)
+          toolPath=$(jq -r '."ci-path"' pkgs/test/nixpkgs-check-by-name/scripts/pinned-tool.json)
           # This asks the substituter for the path, which should be there because Hydra will have pre-built and pushed it
           nix-store --realise "$toolPath" --add-root result
       - name: Running nixpkgs-check-by-name