bump actions/upload-artifact@v4

Signed-off-by: Andrea Panattoni <[email protected]>

Author: zeeke

.github/workflows/buildtest.yml

@@ -80,7 +80,7 @@ jobs:
         env:
           LOCAL_SRIOV_CNI_IMAGE: ghaction-sriov-cni:pr-${{github.event.pull_request.number}}
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: always()
         with:
           name: ${{ env.TEST_REPORT_PATH }}