Update nodejs to v20.12.1

This updates nodejs from 18.17 to 20.12 since the former is nearing end-of-life. In addition, the updates to npm and its node-gyp dependencies will fix support for Python 3.12.

Note that we use v20.12.1 instead of v20.12.2 because the latter doesn't appear to have a glibc-217 version yet:

• https://unofficial-builds.nodejs.org/download/release/v20.12.1/
• https://unofficial-builds.nodejs.org/download/release/v20.12.2/

Relates to:

• gitlab-development-kit#2081 (closed)
• &13545