fix upload-artifact@v4

Author: staskh

.github/workflows/ci.yml

@@ -116,7 +116,7 @@ jobs:
         bandit -r iglu_python/ -f json -o bandit-report.json || true
 
     - name: Upload security reports
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: always()
       with:
         name: security-reports