Update CHANGELOG.md

Author: sadortun

CHANGELOG.md

@@ -151,6 +151,7 @@ ___
 - Refactor: uniform issue templates across repos (Manuel Trezza) [#7528](https://github.com/parse-community/parse-server/pull/7528)
 - ci: bump ci environment (Manuel Trezza) [#7539](https://github.com/parse-community/parse-server/pull/7539)
 - Added Cloud Trigger for LiveQuery event beforeUnsubscribe (sadortun) [#7419](https://github.com/parse-community/parse-server/pull/7419)
+- Ensure the startup is completed before calling startupCompleted (sadortun) [#7525](https://github.com/parse-community/parse-server/pull/7525)
 
 ## 4.10.3
 [Full Changelog](https://github.com/parse-community/parse-server/compare/4.10.2...4.10.3)