build: fix vscode-extension.yml

Author: LastLeaf

.github/workflows/vscode-extension.yml

@@ -54,6 +54,10 @@ jobs:
     needs: build
     if: success() && startsWith(github.ref, 'refs/tags/')
     steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
       - run: vscode-extension/build/init.sh
       - uses: actions/download-artifact@v4
         with: