upgrade pages artefact action

Author: buehler

.github/workflows/jekyll.yml

@@ -53,7 +53,7 @@ jobs:
           JEKYLL_ENV: production
       - name: Upload artifact
         # Automatically uploads an artifact from the './_site' directory by default
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
 
   # Deployment job
   deploy: