fix: examples/cms-keystonejs-embedded/package.json to reduce vulnerab…

…ilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-PROMPTS-1729737
- https://snyk.io/vuln/SNYK-JS-SHELLQUOTE-1766506
- https://snyk.io/vuln/SNYK-JS-TAR-1579152
- https://snyk.io/vuln/SNYK-JS-TAR-1579155

examples/cms-keystonejs-embedded/package.json

@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "@keystone-next/fields": "^15.0.0",
-    "@keystone-next/keystone": "^25.0.0",
+    "@keystone-next/keystone": "^27.0.2",
     "next": "10.2.2",
     "react": "18.2.0",
     "react-dom": "18.2.0"