Add changelog entry

Author: colinrotherham

CHANGELOG.md

@@ -95,6 +95,7 @@ We've made fixes to NHS.UK frontend in the following pull requests:
 - [#1169: Update visually hidden behaviour to match GOV.UK Frontend](https://github.com/nhsuk/nhsuk-frontend/pull/1169)
 - [#1173: Focus skip link target to improve screen reader announcements](https://github.com/nhsuk/nhsuk-frontend/pull/1173)
 - [#1174: Fix Table component responsive semantics when `firstCellIsHeader` is set](https://github.com/nhsuk/nhsuk-frontend/pull/1174)
+- [#1221: Fix JavaScript exports to use CommonJS by default](https://github.com/nhsuk/nhsuk-frontend/pull/1221)
 
 ## 9.3.0 - 13 February 2025