docs: fix publish error

.github/workflows/docs.yaml

@@ -26,7 +26,7 @@ jobs:
         run: python -m mkdocs build --strict
       - name: Push docs to Github Pages
         # Run "invoke mkdocs.deploy" to create the "gh-pages" branch and deploy it first, otherwise this step fails
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           personal_token: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
           publish_dir: ./public