chore: update changelog for release 1.58.3

Signed-off-by: Mark Phelps <209477+markphelps@users.noreply.github.com>

Author: markphelps

CHANGELOG.md

@@ -3,6 +3,13 @@
 This format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+
+## [v1.58.3](https://github.com/flipt-io/flipt/releases/tag/v1.58.3) - 2025-05-26
+
+### Fixed
+
+- `storage`: allow force deletion of namespace with complex cfg (#4253)
+
 ## [v1.58.2](https://github.com/flipt-io/flipt/releases/tag/v1.58.2) - 2025-05-22
 
 ### Fixed