Upgrade JS package `generator-grow` to use Node.js v20

[eason9487]

Changes proposed in this Pull Request:

Part of #108

This PR:

• Bump dependencies and regenerate package-lock.json with Node.js v20.
• Set minimum support for Node.js to "^18.17.0 || >=20.5.0", which align with the dependencies' minimum (yeoman-generator@7.1.1).
• Add the 'node:' prefix to explicitly indicate it requires a Node.js core module.
• Remove an unused file - ./generators/github/package.json
• Fix the incompatible paths when composing generators.
• Fix the tests.

Detailed test instructions:

1. Use Node.js >= 20.5.0
2. cd packages/js/generator-grow
3. npm install
4. npm test to see if tests can pass
5. npm install -g yo
6. npm link
7. Find a temporary empty directory
8. npm init
9. yo grow or yo grow:github to see if it can add boilerplate
10. Repeat the test with Node.js matches ^18.17.0