feat: avoid querying for latest Node version

feat: avoid querying for latest Node version

Avoids:

    Error: failed to download version index (https://nodejs.org/dist/index.tab)

if you try to run without a network connection.

Obviously, `install` will only work if the 14.4.0 has been previously
downloaded, and the Yarn cache has been primed, but if you were able to
clone the repo and run it once, the above will probably be true.