Document what node version is used for various tags

[consideRatio]

I think this could be important debugging info, for example about socket leaks in #434 because we are relying on node library's http(s) server here.

CHP	node	Date
4.6.3	v20.13.1	Jan 12 2025
4.6.2	v20.13.1	June 10 2024
4.6.1	v20.10.0	Nov 27 2023
4.6.0	v18.18.2	Sep 19 2023
4.5.6	v18.17.1	Aug 10 2023
4.5.5	v18.15.0	Apr 3 2023
4.5.4	v18.12.1	Dec 5 2022
4.5.3	v16.17.0	Sep 9 2022
4.5.2	v16.17.0	Aug 19 2022
4.5.1	v16.13.2	Feb 3 2022
4.5.0	v14.17.3	Jul 19 2021

[minrk]

Perhaps we should make the major version explicit in the Dockerfile, so that there's a clearer record of when it changes.