update changelog

CHANGELOG.md

@@ -15,6 +15,14 @@ it according to semantic versioning. For example, if your PR adds a breaking cha
 should change the heading of the (upcoming) version to include a major version bump.
 
 -->
+# 5.14.3
+
+## Dev
+- update tsconfigs:
+  - `"importHelpers": false` to remove need for tslib dependency [#3958](https://github.com/rjsf-team/react-jsonschema-form/issues/3958)
+  - increase compilation target level from es6 to es2018 (so there are no need for transpiling object spread/rest feature)
+  - add missing typescript project reference for `snapshot-tests` in a root tsconfig, update it to also use es modules
+
 # 5.14.2
 
 ## @rjsf/antd