Update changelog.

Author: T4rk1n

CHANGELOG.md

@@ -2,6 +2,12 @@
 All notable changes to `dash` will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
+## [UNRELEASED]
+
+## Fixed 
+
+- [#2634](https://github.com/plotly/dash/pull/2634) Fix deprecation warning on pkg_resources, fix [#2631](https://github.com/plotly/dash/issues/2631)
+
 ## [2.13.0] 2023-08-28
 ## Changed