[8.x](backport #42804) chore: add missing changelog entry about a fix from elastic-agent-libs (#43141)

* chore: update elastic-agent-libs to v0.18.8 (#42804)

* chore: update elastic-agent-libs

* add changelog

* fix changelog entry

(cherry picked from commit d1450fa)

* update changelog

---------

Co-authored-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>

Author: mergify[bot]

CHANGELOG.next.asciidoc

@@ -18,6 +18,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Fix metrics not being ingested, due to "Limit of total fields [10000] has been exceeded while adding new fields [...]". The total fields limit has been increased to 12500. No significant performance impact on Elasticsearch is anticipated. {pull}41640[41640]
 - Fix templates and docs to use correct `--` version of command line arguments. {issue}42038[42038] {pull}42060[42060]
 - removed support for a single `-` to precede multi-letter command line arguments.  Use `--` instead. {issue}42117[42117] {pull}42209[42209]
+- The Beats logger and file output rotate files when necessary. The beat now forces a file rotation when unexpectedly writing to a file through a symbolic link.
 
 *Auditbeat*