Update GitHub Actions workflow to use upload-pages-artifact@v3

Author: tebemis

.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@v3
 
   # Deployment job
   deploy: