Update peaceiris/actions-gh-pages action to v4

Author: renovate[bot]

.github/workflows/generate_github_pages.yml

@@ -32,7 +32,7 @@ jobs:
           mkdir -p screenshots/en
           cp tests/uitests/src/test/snapshots/images/* screenshots/en
       - name: Deploy GitHub Pages
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./screenshots