Bump peaceiris/actions-gh-pages from 3 to 4 (#267)

Author: dependabot[bot]

.github/workflows/sphinx-make-page.yml

@@ -53,7 +53,7 @@ jobs:
         path: gh-pages
     - name: Deploy Pages
       if: ${{ success() && github.event_name != 'pull_request' && !env.ACT }}
-      uses: peaceiris/actions-gh-pages@v3
+      uses: peaceiris/actions-gh-pages@v4
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
         publish_dir: ./_build/html