Update upload-pages-artifact action

Author: Pyrofab

.github/workflows/publish.yaml

@@ -57,7 +57,7 @@ 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@v4
 
   # Deployment job
   deploy: