fix: examples/interframeworkability/react-pure/package.json to reduce…

… vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BODYPARSER-7926860
- https://snyk.io/vuln/SNYK-JS-EXPRESS-7926867
- https://snyk.io/vuln/SNYK-JS-SEND-7926862
- https://snyk.io/vuln/SNYK-JS-SERVESTATIC-7926865

examples/interframeworkability/react-pure/package.json

@@ -46,6 +46,6 @@
     "react": "^16.8.6",
     "redux": "^4.0.1",
     "react-dom": "^16.8.6",
-    "express": "4.19.2"
+    "express": "4.21.0"
   }
 }