v4.21.0

What's Changed

• Introduction of @elastic/highlightjs-esql package by @vadimkibana in #225
• Fix: Mark the left-hand tuple of a multi-column IN as incomplete while its subquery is missing by @bartoval in #229
• chore: version packages by @github-actions[bot] in #228

Full Changelog: v4.20.0...v4.21.0