ckeditor5-dev-webpack-plugin and other js dependencies are deprecated

Might be time to switch to vite.

CKEditor support for vite is still experimental; last year, when I added the editor to a TypeScript project (not a plugin, just getting the standard editor set up), it was a bit of a pain. I think the official build toolchain is all in webpack, so it's probably better to stick with webpack for now.

Ok, had a look at https://github.com/ckeditor/ckeditor5-dev/releases/tag/v32.0.0 and decided to remove @ckeditor/ckeditor5-dev-utils as I could not see anywhere it was being used in scripts or imports. Also updated all dependencies and audit now shows zero deprecations. Building the JS library makes no changes to the built code.

Confirmed again that running the build with the change doesn't alter anything in the build. I've updated to the latest point releases and I'm going to commit this. 3 months is long enough to wait for someone else to review my work.

Automatically closed - issue fixed for 2 weeks with no activity.