Update test.yml

Author: mgrinko

.github/workflows/test.yml

@@ -23,7 +23,7 @@ jobs:
     - run: npm test
     - name: Upload HTML report(backstop data)
       if: ${{ always() }}
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: report
         path: backstop_data