Migrating rocket from standalone to Docker. Meteor requires Node v14.0.0 or later

Description

I’m trying to move our standalone Rocket.Chat 4.3.1 running on Debian, to a Docker installation but struggle getting success.
If I try to upgrade the existing installation to 4.7.0 prior to attempting a database move, I get stuck with a “Meteor requires Node v14.0.0 or later.”.
Have tried different ways of upgrading nodejs, but I always get this error.

Server Setup Information

Rocket.Chat server Version 4.3.1
Standalone/tar installation
Debian 11
Apps Engine Version: 1.29.1
Node Version: v12.18.4
MongoDB: 5.0.6 / wiredTiger (oplog Enabled)
NodeJS Version: 12.18.4
Proxy: nginx