docs(changelog): Move SurfaceView entry to Unreleased

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: romtsn

CHANGELOG.md

@@ -1,12 +1,14 @@
 # Changelog
 
-## 8.40.0
+## Unreleased
 
 ### Features
 
 - Session Replay: experimental support for capturing `SurfaceView` content (e.g. Unity, video players, maps) ([#5333](https://github.com/getsentry/sentry-java/pull/5333))
   - To enable, set `options.sessionReplay.isCaptureSurfaceViews = true`
 
+## 8.40.0
+
 ### Fixes
 
 - Fix `NoSuchMethodError` for `LayoutCoordinates.localBoundingBoxOf$default` on Compose touch dispatch with AGP 8.13 and `minSdk < 24` ([#5302](https://github.com/getsentry/sentry-java/pull/5302))