ci: update upload action

It's failing otherwise.

Signed-off-by: Simon de Vlieger <[email protected]>

Author: supakeen

.github/workflows/test.yaml

@@ -68,7 +68,7 @@ jobs:
       run: xvfb-run pytest --e2e test/e2e --html=test/e2e/report/index.html --self-contained-html
 
     - name: Publish test results
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: always()
       with:
         name: test-report