Update CKEditor5 to 47.3.0

[indigoxela]

This is an ongoing task to keep the editor library up to date.

We're currently on CKEditor5 46.0.3

Available latest version:

• CKEditor5 v47.3.0 release notes

It might be that another update gets available until core feature freeze for 1.33, we'll see.

CKEditor: Checklist for manual tests (from our wiki page):

Core functionality

• Link dialog and balloon toolbar
• Image dialog (open it, upload or select image and insert, replace image)
• Image caption toggle
• Image alignment
• Image drag-and-drop upload
• Styles configuration and usage in content
• Try different editor toolbar setups (less toolbar buttons, more toolbar buttons, different button combinations)
• Nested tags like tables or lists (save and then re-open the editor)
• Create a list (ol or ul) and save the node, make sure, the data-list-item-id attribute got removed from li after saving
• Add the Emojis button to the toolbar and open a node form - verify the button is there and functional

Note that the latest (Emoji) can only get tested, after #7014 got merged - it's currently broken.

[indigoxela]

Here we go: backdrop/backdrop#5171
Again: for testing keep in mind, that Emojis are still broken until the other PR got merged.

I only did some quick (and sloppy) testing and things seem to work as expected.