Update JamesIves/github-pages-deploy-action action to v4

Author: renovate[bot]

bin/template/.github/workflows/deploy-gh-pages.yml

@@ -21,7 +21,7 @@ jobs:
           bundle exec nanoc check internal_links mixed_content stale
 
       - name: Deploy 🚀
-        uses: JamesIves/github-pages-deploy-action@3.7.1
+        uses: JamesIves/github-pages-deploy-action@v4.8.0
         with:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           BRANCH: gh-pages