upgrade actions/upload-artifact to v4 since v3 is deprecated

Author: prabhakar267

.github/workflows/ci.yml

@@ -85,7 +85,7 @@ jobs:
         bandit -r . -f json -o bandit-report.json || true
         
     - name: Upload bandit report
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: always()
       with:
         name: bandit-security-report