fix: examples/typescript-ex/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AJV-15274295

Author: snyk-bot

examples/typescript-ex/package.json

@@ -28,6 +28,6 @@
     "typescript": "~4.1.3"
   },
   "dependencies": {
-    "cloudevents": "~4.0.0"
+    "cloudevents": "~6.0.0"
   }
 }