Adds changelog

Author: antonis

CHANGELOG.md

@@ -6,6 +6,14 @@
 > make sure you follow our [migration guide](https://docs.sentry.io/platforms/react-native/migration/) first.
 <!-- prettier-ignore-end -->
 
+## Unreleased
+
+### Dependencies
+
+- Bump Cocoa SDK from v8.57.2 to v9.0.0-alpha.0 ([#5356](https://github.com/getsentry/sentry-react-native/pull/5356))
+  - [changelog](https://github.com/getsentry/sentry-cocoa/blob/main/CHANGELOG.md#900-alpha0)
+  - [diff](https://github.com/getsentry/sentry-cocoa/compare/8.57.2...9.0.0-alpha.0)
+
 ## 7.6.0
 
 ### Fixes