Bump node version to 18 to make pdfjs-dist happy

Author: yanzexuan1

.github/workflows/ci.yaml

@@ -37,7 +37,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: 16
+          node-version: 18
       - name: Build
         run: |
           npm install yarn -g