Update actions/upload-pages-artifact action to v5

Author: renovate[bot]

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

@@ -35,7 +35,7 @@ jobs:
           source: ./
           destination: ./_site
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v5
 
   # Deployment job
   deploy: