[8.14](backport #39320) Add change log for S3 fix (#39328)

* add change log for S3 fix (#39320)

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Co-authored-by: Fae Charlton <fae.charlton@elastic.co>

CHANGELOG.next.asciidoc

@@ -142,6 +142,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Updated Websocket input title to align with existing inputs {pull}39006[39006]
 - Restore netflow input on Windows {pull}39024[39024]
 - Upgrade azure-event-hubs-go and azure-storage-blob-go dependencies. {pull}38861[38861]
+- Fix concurrency/error handling bugs in the AWS S3 input that could drop data and prevent ingestion of large buckets. {pull}39131[39131]
 
 *Heartbeat*