Update changelog

Author: insistence

CHANGELOG.md

@@ -2,12 +2,14 @@
 All notable changes to `dash` will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
-## [2.17.1] - 2024-06-12
+## [UNRELEASED]
 
 ## Added
 
 - [#2881](https://github.com/plotly/dash/pull/2881) Add outputs_list to window.dash_clientside.callback_context. Fixes [#2877](https://github.com/plotly/dash/issues/2877).
 
+## [2.17.1] - 2024-06-12
+
 ## Fixed
 
 - [#2860](https://github.com/plotly/dash/pull/2860) Fix dcc.Loading to apply overlay_style only to the children and not the spinner. Fixes [#2858](https://github.com/plotly/dash/issues/2858)