Move changelog entry pending PR

Signed-off-by: Douglas Camata <[email protected]>

CHANGELOG.md

@@ -14,6 +14,8 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 
 ### Added
 
+- [#5440](https://github.com/thanos-io/thanos/pull/5440) HTTP metrics: export number of in-flight HTTP requests.
+
 ### Changed
 
 ### Removed
@@ -35,7 +37,6 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
 - [#5391](https://github.com/thanos-io/thanos/pull/5391) Receive: Implement api/v1/status/tsdb.
 - [#5424](https://github.com/thanos-io/thanos/pull/5424) Receive: export metrics regarding size of remote write requests.
 - [#5420](https://github.com/thanos-io/thanos/pull/5420) Receive: Automatically remove stale tenants.
-- [#5440](https://github.com/thanos-io/thanos/pull/5440) HTTP metrics: export number of in-flight HTTP requests.
 
 ### Changed