DOC: update changelog for RingClusterMotor

Add unreleased changelog entry for PR RocketPy-Team#924 (RingClusterMotor annular cluster feature).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Gui-FernandesBR

CHANGELOG.md

@@ -32,6 +32,7 @@ Attention: The newest changes should be on top -->
 
 ### Added
 
+- ENH: Add RingClusterMotor for annular clustered motor modeling [#924](https://github.com/RocketPy-Team/RocketPy/pull/924)
 - ENH: MNT: introduce pressure unit conversion when using forecast/reanalysis/ensemble data [#955](https://github.com/RocketPy-Team/RocketPy/pull/955)
 - ENH: Auto Populate Changelog [#919](https://github.com/RocketPy-Team/RocketPy/pull/919)
 - ENH: Adaptive Monte Carlo via Convergence Criteria [#922](https://github.com/RocketPy-Team/RocketPy/pull/922)