docs: pin react version to 18 in Next.js 14 upgrade guide

docs/01-app/03-building-your-application/11-upgrading/04-version-14.mdx

@@ -10,19 +10,19 @@ description: Upgrade your Next.js Application from Version 13 to 14.
 To update to Next.js version 14, run the following command using your preferred package manager:
 
 ```bash filename="Terminal"
-npm i next@next-14 react@latest react-dom@latest && npm i eslint-config-next@next-14 -D
+npm i next@next-14 react@18 react-dom@18 && npm i eslint-config-next@next-14 -D
 ```
 
 ```bash filename="Terminal"
-yarn add next@next-14 react@latest react-dom@latest && yarn add eslint-config-next@next-14 -D
+yarn add next@next-14 react@18 react-dom@18 && yarn add eslint-config-next@next-14 -D
 ```
 
 ```bash filename="Terminal"
-pnpm i next@next-14 react@latest react-dom@latest && pnpm i eslint-config-next@next-14 -D
+pnpm i next@next-14 react@18 react-dom@18 && pnpm i eslint-config-next@next-14 -D
 ```
 
 ```bash filename="Terminal"
-bun add next@next-14 react@latest react-dom@latest && bun add eslint-config-next@next-14 -D
+bun add next@next-14 react@18 react-dom@18 && bun add eslint-config-next@next-14 -D
 ```
 
 > **Good to know:** If you are using TypeScript, ensure you also upgrade `@types/react` and `@types/react-dom` to their latest versions.