Bumped upload-pages-artifact to v3

Author: rjrudin

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

@@ -35,7 +35,7 @@ jobs:
           source: ./docs/
           destination: ./_site
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
 
   # Deployment job
   deploy: