Update CHANGELOG.md

Author: ramsessanchez

CHANGELOG.md

@@ -11,6 +11,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+## [5.71.0] - 2023-09-22
+
+### Added 
+
+- MacOSDmgApp model and derived requests. 
+- MacOSIncludedApp model.
+- RotateBitLockerKeysDeviceActionResult model.
+- UserExperienceAnalyticsDeviceStartupProcessPerformance model and derived requests.
+
+### Removed
+
+- ManagedMobileLobApp and MobileLobApp requests.  
+
 ## [5.70.0] - 2023-09-08
 
 ### Added