Add changelog entry

Author: weltenwort

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 - Added documentation entry in `EuiPagination` for `activePage` prop. ([#1740](https://github.com/elastic/eui/pull/1740))
 - Changed `EuiButton` to use "m" as it's default `size` prop ([#1742](https://github.com/elastic/eui/pull/1742))
+- Enhanced the build process to emit TypeScript types for the variables extracted from the themes ([#1750](https://github.com/elastic/eui/pull/1750))
 
 ## [`9.4.2`](https://github.com/elastic/eui/tree/v9.4.2)