v2023.8.20 - Remove ci for nodejs-v19, and add ci for nodejs-v20.

• ci - Remove ci for nodejs-v19, and add ci for nodejs-v20.
• ci - Remove broken-links to unlicense.org, failing http-link-check.

What's Changed

• v2023.8.20 by @kaizhu256 in #445

Full Changelog: v2023.7.21...v2023.8.20