add changelog entry

Author: msukkari

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 - Fixed typos in UI, docs, code [#369](https://github.com/sourcebot-dev/sourcebot/pull/369)
+- Add anonymous access option to core [#385](https://github.com/sourcebot-dev/sourcebot/pull/385)
 
 ## [4.5.1] - 2025-07-14