attempt to fix build

[kfcampbell]

Work-in-progress experiments to fix the broken builds on this repo.

This PR:

• tests using Node 20 instead of Node 18
• Gets the latest version of vercel/ncc
• Explicitly updates the octokit/action version to ^6.0.7
• Adds a workflow_dispatch trigger for the test Action

[github-actions]

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[gr2m]

I would recommend to use https://github.com/actions/create-github-app-token/ as a reference, that's how I'd setup actions these days. esbuild creates much more readable build files, is faster, and simpler. And as actions support Node 20 now, we can use ES Modules.

[wolfy1339]

Bumping it to use the NodeJS 20 runner fixed things.

The problem is that undici requires NodeJS >= 18 as of now: https://github.com/nodejs/undici/blob/v6.13.0/package.json#L128

Undici was introduced via @octokit/action v6