fix: separate Node.js setup and npm install steps

- Fix GitHub Actions syntax error
- Split setup-node and npm ci into separate steps

.github/workflows/test.yml

@@ -22,6 +22,7 @@ jobs:
         with:
           node-version: ${{ matrix.node-version }}
 
+      - name: Install dependencies
         run: npm ci
 
       - name: Run tests