docs: remove @types/eslint__js from quickstart step (typescript-eslint#10349)

Author: ntnyq

docs/getting-started/Quickstart.mdx

@@ -24,7 +24,7 @@ This page is a quick-start for [ESLint's new "flat" config format](https://eslin
 First, install the required packages for [ESLint](https://eslint.org), [TypeScript](https://typescriptlang.org), and [our tooling](../packages/TypeScript_ESLint.mdx):
 
 ```bash npm2yarn
-npm install --save-dev eslint @eslint/js @types/eslint__js typescript typescript-eslint
+npm install --save-dev eslint @eslint/js typescript typescript-eslint
 ```
 
 ### Step 2: Configuration