fix: upgrade react-native-web from 0.11.7 to 0.21.1

Snyk has created this PR to upgrade react-native-web from 0.11.7 to 0.21.1.

See this package in npm:
react-native-web

See this project in Snyk:
https://app.snyk.io/org/sammytezzy/project/916e130a-514c-47db-a7c6-b9cc2e99b04a?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

examples/react-native/package.json

@@ -12,7 +12,7 @@
     "react": "~16.9.0",
     "react-dom": "~16.9.0",
     "react-native": "https://github.com/expo/react-native/archive/sdk-37.0.1.tar.gz",
-    "react-native-web": "~0.11.7",
+    "react-native-web": "~0.21.1",
     "socket.io": "^4.0.0",
     "socket.io-client": "^4.0.0"
   },