docs: update yarn contributing requirements with corepack

CONTRIBUTING.md

@@ -201,7 +201,7 @@ We try to tag all issues with a `pkg/` or `npm/` tag describing the appropriate
 You must have the following installed on your system to contribute locally:
 
 - [`Node.js`](https://nodejs.org/en/) (See the root [.node-version](.node-version) file for the required version. You can find a list of tools on [node-version-usage](https://github.com/shadowspawn/node-version-usage) to switch the version of [`Node.js`](https://nodejs.org/en/) based on [.node-version](.node-version).)
-- [`yarn`](https://yarnpkg.com/en/docs/install)
+- [`Yarn v1 Classic`](https://yarnpkg.com/en/docs/install). If you have [`Node.js`](https://nodejs.org/en/) experimental [corepack](https://nodejs.org/docs/latest/api/corepack.html) enabled, installation of the Yarn package manager will be handled automatically. Attempting to install Yarn globally with npm will fail if [corepack](https://nodejs.org/docs/latest/api/corepack.html) is enabled.
 - [`python`](https://www.python.org/downloads/) (since we use `node-gyp`. See their [repo](https://github.com/nodejs/node-gyp) for Python version requirements.)
 
 #### Debian/Ubuntu