Update book.yml

Author: pnavaro

.github/workflows/book.yml

@@ -25,5 +25,5 @@ jobs:
     - name: GitHub Pages action
       uses: peaceiris/actions-gh-pages@v4
       with:
-        deploy_key: ${{ secrets.GITHUB_TOKEN }}
+        github_token: ${{ secrets.GITHUB_TOKEN }}
         publish_dir: ./notebooks/_build/html