ci: drop node.js 14.x and 16.x testing

[MikeMcC399]

• supports resolution of Migrate to ESLint flat config for CI tests #529
• closes Drop Node.js 14.x and 16.x testing in CI #535

Issue

• Node.js 14.x and 16.x reached Node.js End-of-life more than one year ago and so are unsupported by Node.js.
• To lint TypeScript in a flat configuration, a minimum @typescript-eslint/eslint-plugin@7.0.0 is required, which in turn requires Node.js ^18.18.0. This rules out Node.js 14.x and 16.x.

Change

• Remove 14.x and 16.x from the node-version matrix in .github/workflows/ci.yml.

[ddzz]

We should remove 14 and 16 from the engines in the package.json as well.

[ddzz]

@bmish Can you review this PR and its related issues when you have a moment?

[MikeMcC399]

I was originally planning to delay modifying engines until the repo is compatible with ESLint v9, then change the prerequisites of eslint and engines together. I guess the order does not matter too much so long as no new version is released. Modifying engines would be a breaking change anyway.

[ddzz]

@bmish is MIA so I'll approve and merge this. We should add Node 20.x to the matrix in another PR. Thanks for all your work in this repo!

[MikeMcC399]

@ddzz

@bmish is MIA so I'll approve and merge this. We should add Node 20.x to the matrix in another PR. Thanks for all your work in this repo!

Thank you! This makes it cleaner for the follow-on PRs. I'm happy to work on this knowing you are there to review and merge. 🙂 I don't think we need @bmish at this time. He may still be traveling.

[MikeMcC399]

@ddzz

We should add Node 20.x to the matrix in another PR.

Agreed, however the workflow is not yet compatible with Node.js >= 20 (otherwise I would have already added it). I am however planning to look at this.