Update ChangeLog

Author: sebastianbergmann

ChangeLog-12.3.md

@@ -15,6 +15,7 @@ All notable changes of the PHPUnit 12.3 release series are documented in this fi
 ### Changed
 
 * [#6237](https://github.com/sebastianbergmann/phpunit/issues/6237): Do not run tests when code coverage analysis is requested but code coverage data cannot be collected
+* [#6272](https://github.com/sebastianbergmann/phpunit/issues/6272): Use `@<data-set-name>` format (compatible with `--filter` CLI option) in defect messages
 
 ### Deprecated