fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - react from 18.2.0 to 18.3.1.
    See this package in npm: https://www.npmjs.com/package/react
  - react-dom from 18.2.0 to 18.3.1.
    See this package in npm: https://www.npmjs.com/package/react-dom

See this project in Snyk:
https://app.snyk.io/org/create-mern-app/project/a63ef512-260c-4503-ad3e-6695a383e8a9?utm_source=github&utm_medium=referral&page=upgrade-pr

templates/library/nextjs-library-boilerplate/example/package.json

@@ -13,7 +13,7 @@
         "eslint-config-next": "13.2.1",
         "next": "13.2.1",
         "next-library": "link:..",
-        "react": "18.2.0",
-        "react-dom": "18.2.0"
+        "react": "18.3.1",
+        "react-dom": "18.3.1"
     }
 }