📝 add changelog entry for health endpoint feature (#3460)

Author: lfelipediniz

CHANGELOG.md

@@ -12,6 +12,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - [#3424](https://github.com/plotly/dash/pull/3424) Adds support for `Patch` on clientside callbacks class `dash_clientside.Patch`, as well as supporting side updates, eg: (Running, SetProps).
 - [#3347](https://github.com/plotly/dash/pull/3347) Added 'api_endpoint' to `callback` to expose api endpoints at the provided path for use to be executed directly without dash.
 - [#3445](https://github.com/plotly/dash/pull/3445) Added API to reverse direction of slider component.
+- [#3460](https://github.com/plotly/dash/pull/3460) Add `/health` endpoint for server monitoring and health checks.
 - [#3465](https://github.com/plotly/dash/pull/3465) Plotly cloud integrations, add devtool API, placeholder plotly cloud CLI & publish button, `dash[cloud]` extra dependencies. 
 
 ## Fixed