Remove @types/browserslist and update browserslist (#5182)

`@types/browserslist@4.15.0` has been deprecated because `browserslist@4.16.3` provides its own type definitions.
So, this change removes `@types/browserslist` and updates `browserslist` to the latest version.

I execute the following commands to update `package.json` and `package-lock.json`:

```shell
npm rm @types/browserslist
npm up browserslist
```

See below:
- https://www.npmjs.com/package/@types/browserslist/v/4.15.0
- https://github.com/browserslist/browserslist/blob/4.16.3/index.d.ts

Close #5118

package.json

@@ -168,7 +168,6 @@
     "@stylelint/prettier-config": "^2.0.0",
     "@stylelint/remark-preset": "^2.0.0",
     "@types/balanced-match": "^1.0.1",
-    "@types/browserslist": "^4.8.0",
     "@types/debug": "^4.1.5",
     "@types/file-entry-cache": "^5.0.1",
     "@types/global-modules": "^2.0.0",