fixing changelog

Signed-off-by: Naman-B-Parlecha <[email protected]>

Author: Naman-B-Parlecha

CHANGELOG.md

@@ -16,6 +16,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 ### Added
 
 - [#8238](https://github.com/thanos-io/thanos/pull/8238) Receive: add shuffle sharding support
+- [#8266](https://github.com/thanos-io/thanos/pull/8266) Website: maintain expanded state based on current page
 
 ### Changed