fix: checkout the code

Author: fuzzzerd

.github/workflows/pull-request.yml

@@ -10,6 +10,9 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with: