Update nextjs sass broken link (#19537)

Author: martinscooper

packages/react/README.md

@@ -31,7 +31,7 @@ links:
 For info on how to configure Sass for your project, here are some common
 framework's documentation worth reviewing:
 
-- [Next.js with Sass](https://nextjs.org/docs/basic-features/built-in-css-support#sass-support)
+- [Next.js with Sass](https://nextjs.org/docs/app/guides/sass)
 - [Remix with Sass](https://remix.run/docs/en/1.18.0/guides/styling#css-preprocessors)
 - [Gatsby with Sass](https://www.gatsbyjs.com/docs/how-to/styling/sass/)