Update CHANGELOG.md

Co-authored-by: Lukas Stracke <[email protected]>

Author: mydea

CHANGELOG.md

@@ -18,7 +18,7 @@ v8.
 - **feat(browser): Create spans as children of root span by default (#10986)**
 
 Because execution context isolation in browser environments does not work reliably, we deciced to keep a flat span
-hierarchy by default in v9.
+hierarchy by default in v8.
 
 - **feat(core): Deprecate `addTracingExtensions` (#11579)**