docs: add changelog entry

Author: DannyvdSluijs

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - ci: Run workflows against 5.x.x branches ([#859](https://github.com/jsonrainbow/json-schema/pull/859))
 ### Fixed
 - UriValidator: Allow `file:/` and `file:///` ([#856](https://github.com/jsonrainbow/json-schema/discussions/856))
+- Fix .php-cs-fixer.dist.php export-ignore ([#861](https://github.com/jsonrainbow/json-schema/discussions/861))
 
 ## [6.6.3] - 2025-12-02
 ### Changed