Finalise CHANGELOG content ahead of release

[romaricpascal]

What

1. Add missing entries for:

   • Fix null aria attributes #600
   • Update packages, configs + Node.js 20 #612 (explaining what may break because of it)

2. Review the list of merged pull requests since the last release

Why

To make sure the CHANGELOG is up to date ahead of a new release

Who needs to work on this

Developer, Technical writer

Who needs to review this

Developer, Technical writer

Done when

• The CHANGELOG is up to date with what will be released