[v9] Bump minimum supported Node.js version

[lforst]

Description

Go through engines fields in package.jsons and all READMEs if applicable and bump the minimum supported Node.js versions based on what we researched in #14256

[lforst]

UPDATE: OTEL plans on releasing a v2 version and they will likely bump to 18, meaning we would need to do the same. This task should be delayed until OTEL has decided on what to do.