Build/Test Tools: Update the README file to reflect new Node.js/npm v…

…ersions.

Follow up to [56378].

Props dantovbein, hbhalodia.
Fixes #59071. See #56658.

git-svn-id: https://develop.svn.wordpress.org/trunk@56387 602fd350-edb4-49c9-b593-d223f7449a82

README.md

@@ -35,7 +35,7 @@ You will need Node and npm installed on your computer. Node is a JavaScript runt
 
 If you are not using a package manager, see the [Node.js download page](https://nodejs.org/en/download/) for installers and binaries.
 
-**Note:** WordPress currently only supports Node.js `14.x` and npm `6.x`.
+**Note:** WordPress currently only officially supports Node.js `16.x` and npm `8.x`.
 
 You will also need [Docker](https://www.docker.com/products/docker-desktop) installed and running on your computer. Docker is the virtualization software that powers the local development environment. Docker can be installed just like any other regular application.