Update jekyll-gh-pages.yml

.github/workflows/jekyll-gh-pages.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v2
         with:
-          node-version: '14' # or your preferred Node.js version
+          node-version: '20' # or your preferred Node.js version
       - name: Change to Frontend Directory
         run: cd frontend