Update Docs to use React v19 (#1210)

Author: danielguillan

apps/next-docs/content/components/Label/index.mdx

@@ -8,8 +8,6 @@ thumbnail: '/images/thumbnails/label-thumbnail.png'
 thumbnail_darkMode: '/images/thumbnails/label-thumbnail-dark.png'
 ---
 
-import {Box as Container} from '@primer/react'
-
 ![An image showing a group of labels with different styles, colors, leading icons and content.](https://github.com/primer/brand/assets/6951037/1c9c6b81-0a2a-4a56-a9f5-a9608f89e220)
 
 ## Usage