ansible: update www Node.js version

[richardlau]

Update the version of Node.js used on the www server from Node.js 16 (16.20.2) to Node.js 22 (22.11.0).

Refs: #3958 (comment)

[richardlau]

Since we don't run the Ansible scripts against the live server, I've run:

$ apt-get remove nodejs
$ rm /etc/apt/sources.list.d/nodesource.list*
$ bash -c 'curl -sL https://deb.nodesource.com/setup_22.x | bash -'
$ apt-get install nodejs

to remove the old Node.js version (16.20.2) and Nodesource repositories, and add the new repository and install Node.js from that (which installed Node.js 22.11.0).

root@infra-digitalocean-ubuntu1604-x64-1:~# node -v
v22.11.0
root@infra-digitalocean-ubuntu1604-x64-1:~#