* Update nvmrc to Node.js 16

* Update package.json minimum Node engine to 16

* Update README requirements to Node.js 16

* Update devcontainer Node.js version to 16

* Update devcontainer Dockerfile Node.js choices to LTS versions that are still in support/maintenance

* Pin CircleCI Node image to 16

* Fix YAML type issue

* Update CircleCI Node.js to 16.18 to match #22019

* Update config.yml

* Update Dockerfile

* Update .nvmrc

* Update Dockerfile

* NodeJS 10 is EOL.

* Update package.json

* Update README.md

* Update Vagrantfile

* Update Dockerfile

* Update Dockerfile

The 4.x branch [entered maintenance](https://github.com/nodejs/LTS#lts-schedule1) on 1 April.