fix(ci): checkout Core repo for test imports

Tests import ../../NoJS/src/index.js which doesn't exist in CI.
Add a checkout step for ErickXavier/no-js at ../NoJS so the
relative path resolves correctly from the test files.

Author: ErickXavier

.github/workflows/ci.yml

@@ -13,6 +13,12 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Checkout NoJS Core
+        uses: actions/checkout@v4
+        with:
+          repository: ErickXavier/no-js
+          path: ../NoJS
+
       - uses: actions/setup-node@v4
         with:
           node-version: 20