Update cpp.yml

Author: uNetworkingAB

.github/workflows/cpp.yml

@@ -20,7 +20,7 @@ jobs:
         language: c++
         fuzz-seconds: 600
     - name: Upload crash
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: failure() && steps.build.outcome == 'success'
       with:
         name: artifacts