[Breaking Change] Node Upgrade to >=20.0.0

[BboyAkers]

What is in this PR?

• Bumping version of the required node version to LTS >=v20.0.0

Why?

Current node version is not maintained.

Additional Info: Currently getting this error below while running npm run test

I did an npm list jackspeak to see further where this package is since it's not in the top-level dependency tree. This was the result. For context, I did upgrade tap to the latest version, 18.7.0.

Would love some eyes on what you might think could be the issue. I'll continue hacking away at debugging this error! @bcoe 🙂

[bcoe]

I think addressed by https://github.com/istanbuljs/nyc/pull/1552