feat!: switch from CJS to ESM and bump Yeoman packages

[JoshuaKGoldberg]

Purpose of this pull request?

Fixes #265.

• Documentation update
• Bug fix
• Enhancement
• Other, please explain: package dependencies and module update

What changes did you make?

• Adds "type": "module" to the package.json
• Bumps all Yeoman dependencies to the latest: in particular the production deps yeoman-generator and yosay
• Bumps the package.json and build.yml Node.js versions to 18+
• WIP: Bumps Jest and switches it to its experimental ESM support

Is there anything you'd like reviewers to focus on?

I opted not to update other dependencies such as Chalk to keep the change minimal. I'd suggest we hold off releasing a new major version with these changes until those come in too.

BREAKING CHANGE: Updates the Node.js engine minimum to ^18.17.0 || >=20.5.0 to align with the current "yeoman-generator" minimums.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​jest/​globals@​26.6.2 ⏵ 29.7.0			+3
	cross-env@​7.0.3

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[JoshuaKGoldberg]

Partially blocked by #270 -> #271.

[socket-security]

All alerts resolved. Learn more about Socket for GitHub.

This PR previously contained dependency changes with security issues that have been resolved, removed, or ignored.

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[JoshuaKGoldberg]

  ● generator:app › scoped name › fills the README with project data

    TypeError: (intermediate value).resolve is not a function

      65 |     const readmeTpl = _.template(this.fs.read(this.templatePath('README.md')));
      66 |
    > 67 |     this.composeWith(import.meta.resolve('generator-node/generators/app'), {

jestjs/jest#14923, which is now newly available in Jest 30 (still in alpha). Fun timing.

[JoshuaKGoldberg]

@mshima I'm having a hard time here. Could I ask for your help, please?

What I'm trying to do is get generator-generator onto the latest yeoman-generator version, to fix #265. I've tried a few strategies and each has test issues I haven't been able to debug:

• This PR: generally switching the package to full ESM, including "type": "module".
• chore: bump Jest to 30.0.2 #274
• chore: switched from Jest to Vitest #275
• chore: bump yeoman-generator to ^7.5.1 #276

[mshima]

Looks like jest doesn’t support 'node:test' module.