update changelog

Author: T4rk1n

CHANGELOG.md

@@ -11,6 +11,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ## Fixed
 - [#3353](https://github.com/plotly/dash/pull/3353) Support pattern-matching/dict ids in `dcc.Loading` `target_components`
 - [#3371](https://github.com/plotly/dash/pull/3371) Fix allow_optional triggering a warning for not found input.
+- [#3379](https://github.com/plotly/dash/pull/3379) Fix dcc.Graph backward compatibility with dash 2.0 for ddk.Graph
 
 # [3.1.1] - 2025-06-29