docs: update migration guide for style-loader v4 (#7272)

Author: chenjiahan

website/docs/en/guide/upgrade/v1-to-v2.mdx

@@ -521,6 +521,7 @@ The built-in rules in the Less/Sass/Stylus plugins have the same `oneOf` change,
 
 - The query parameter `?__inline=false` has been removed, use `?url` instead.
 - The `dev.setupMiddlewares` option is deprecated, use [server.setup](/config/server/setup) instead.
+- `style-loader` has been upgraded from v3 to v4, and some options of `tools.styleLoader` have changed. See the [style-loader v4.0.0 release notes](https://github.com/webpack/style-loader/releases/tag/v4.0.0) for details.
 - The deprecated template parameters have been removed from `html.templateParameters`
   - `webpackConfig`: use `rspackConfig` instead.
   - `htmlWebpackPlugin`: use `htmlPlugin` instead.

website/docs/zh/guide/upgrade/v1-to-v2.mdx

@@ -521,6 +521,7 @@ Less / Sass / Stylus 插件的内置规则也已采用相同的 `oneOf` 结构
 
 - 查询参数 `?__inline=false` 已被移除，使用 `?url` 代替。
 - `dev.setupMiddlewares` 配置项已废弃，请使用 [server.setup](/config/server/setup) 代替。
+- `style-loader` 从 v3 升级到了 v4，`tools.styleLoader` 的部分配置项发生变化，详见 [style-loader v4.0.0 发布说明](https://github.com/webpack/style-loader/releases/tag/v4.0.0)。
 - `html.templateParameters` 中废弃的默认参数已被移除：
   - `webpackConfig`：使用 `rspackConfig` 代替。
   - `htmlWebpackPlugin`：使用 `htmlPlugin` 代替。