Update CHANGELOG.md

Author: lcian

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## Unreleased
+
+### Improvements
+
+- Remove internal API status from get/setDistinctId ([#4708](https://github.com/getsentry/sentry-java/pull/4708))
+
 ## 8.21.1
 
 ### Fixes
@@ -9,12 +15,6 @@
 
 ## 8.21.0
 
-### Improvements
-
-- Remove internal API status from get/setDistinctId ([#4708](https://github.com/getsentry/sentry-java/pull/4708))
-
-## Unreleased
-
 ### Fixes
 
 - Only set log template for logging integrations if formatted message differs from template ([#4682](https://github.com/getsentry/sentry-java/pull/4682))