327 update actions/upload-artifacts to v4 due to v3 deprecation

Author: cthunes

.github/workflows/test-on-PR.yaml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Upload test results
         if: failure()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: coverage-test-failures
           path: ${{ runner.temp }}/package