Update run_notebooks.yml

Author: jamesmontemagno

.github/workflows/run_notebooks.yml

@@ -34,7 +34,7 @@ jobs:
         continue-on-error: true
 
       - name: Upload output as artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: output
           path: output