Add deprecations to changelog

Author: T4rk1n

CHANGELOG.md

@@ -2,6 +2,14 @@
 All notable changes to `dash` will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
+## [UNRELEASED]
+
+## Deprecated
+
+- [#2985](https://github.com/plotly/dash/pull/2985) Deprecate dynamic component loader.
+- [#2985](https://github.com/plotly/dash/pull/2985) Deprecate `run_server`, use `run` instead.
+- [#2899](https://github.com/plotly/dash/pull/2899) Deprecate `dcc.LogoutButton`, can be replaced with a `html.Button` or `html.A`. eg: `html.A(href=os.getenv('DASH_LOGOUT_URL'))` on a Dash Enterprise instance.
+
 ## [2.18.0] - 2024-09-04
 
 ## Added