Update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/update.yaml

@@ -87,7 +87,7 @@ jobs:
 
       - name: Upload artifacts
         if: github.event_name != 'pull_request'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: update_results
           path: |