Update CHANGELOG for version 0.86.2

Updated changelog for version 0.86.2 with fixes and changes.

Author: cipolleschi

CHANGELOG.md

@@ -394,6 +394,14 @@
 
 ## v0.86.2
 
+### Fixed
+
+- **Layout:** Fixed `display: contents` nodes having `hasNewLayout` set incorrectly ([36f69eff0d](https://github.com/react/react-native/commit/36f69eff0d11510f4f16075d9cfbbe474a0683be) by [j-piasecki](https://github.com/j-piasecki))
+
+#### Android
+
+- **Runtime:** Use explicit `ReactInstanceManager.mHasStartedDestroyingLock` instead of using `ReactInstanceManager.mHasStartedDestroying` ([cdfba520fa](https://github.com/react/react-native/commit/cdfba520fa56a6b3dbb133d9c8060e4e698bc8a0) by [jingjing2222](https://github.com/jingjing2222)) 
+- **Runtime:** Do not synchronize on `java.lang.Boolean`. ([821045a24f](https://github.com/react/react-native/commit/821045a24f07f798351c72d23a01720a2123049d) by [Yqwed](https://github.com/yqwed))
 ### Changed
 
 - **Hermes:** Bump Hermes V1 to 250829098.0.16 ([95538111bf](https://github.com/react/react-native/commit/95538111bf24b5d5269724714e415b38b6395d1a) by [@gabrieldonadel](https://github.com/gabrieldonadel))