ci: update .github/workflows/ci.yml

Co-authored-by: Laurențiu Nicola <lnicola@users.noreply.github.com>

Author: hamirmahal

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
       - run: bundle install && bundle exec jekyll build
 
       - name: Deploy
-        uses: peaceiris/actions-gh-pages@364c31d33bb99327c77b3a5438a83a357a6729ad # v3.4.0
+        uses: peaceiris/actions-gh-pages@4f9cc6602d3f66b9c108549d475ec49e8ef4d45e # v4.0.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_branch: master