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-APOLLOSERVERCORE-2928764
- https://snyk.io/vuln/SNYK-JS-LOADERUTILS-3042992
- https://snyk.io/vuln/SNYK-JS-LOADERUTILS-3043105
- https://snyk.io/vuln/SNYK-JS-LOADERUTILS-3105943
- https://snyk.io/vuln/SNYK-JS-NEXT-1540422
- https://snyk.io/vuln/SNYK-JS-NEXT-1577139
- https://snyk.io/vuln/SNYK-JS-NEXT-2405694
- https://snyk.io/vuln/SNYK-JS-NODEFETCH-2342118
- https://snyk.io/vuln/SNYK-JS-PROMPTS-1729737
- https://snyk.io/vuln/SNYK-JS-SHELLQUOTE-1766506
- https://snyk.io/vuln/SNYK-JS-TAR-1579147
- https://snyk.io/vuln/SNYK-JS-TAR-1579152
- https://snyk.io/vuln/SNYK-JS-TAR-1579155

examples/cms-keystonejs-embedded/package.json

@@ -7,8 +7,8 @@
     "start": "next start"
   },
   "dependencies": {
-    "@keystone-next/fields": "^9.0.0",
-    "@keystone-next/keystone": "^18.0.0",
+    "@keystone-next/fields": "^15.0.0",
+    "@keystone-next/keystone": "^25.0.0",
     "next": "10.2.2",
     "react": "18.2.0",
     "react-dom": "18.2.0"