update action

Author: chai2010

.github/workflows/book.yml

@@ -30,6 +30,7 @@ jobs:
         uses: peaceiris/actions-gh-pages@v3
         with:
           personal_token: ${{ secrets.DEPLOY_KEY }}
+          external_repository: golang-china/golang-china.github.io
           publish_dir: ./book
           publish_branch: gh-pages
           user_name: 'github-actions[bot]'