try to fix the ci

Author: pnavaro

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    open-pull-requests-limit: 99
+    labels:
+      - "dependencies"
+      - "github-actions"

.github/workflows/book.yml

@@ -23,7 +23,7 @@ jobs:
       run: jupyter-book build notebooks
 
     - name: GitHub Pages action
-      uses: peaceiris/actions-gh-pages@v3
+      uses: peaceiris/actions-gh-pages@v4
       with:
-        deploy_key: ${{ secrets.SITE_PRIV }}
+        deploy_key: ${{ secrets.GITHUB_TOKEN }}
         publish_dir: ./notebooks/_build/html