Update ChangeLog

Author: sebastianbergmann

ChangeLog-12.3.md

@@ -11,6 +11,7 @@ All notable changes of the PHPUnit 12.3 release series are documented in this fi
 
 ### Fixed
 
+* [#6197](https://github.com/sebastianbergmann/phpunit/issues/6197): `ini_set('error_log')` sets filepath outside `open_basedir`
 * [#6279](https://github.com/sebastianbergmann/phpunit/issues/6279): Deprecation triggered in data provider method affects all test methods using that data provider method
 * [#6281](https://github.com/sebastianbergmann/phpunit/issues/6281): Exceptions raised in after-test method are not reported for skipped tests