add changelog

Author: msukkari

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - Fixed "At least one project, user, or group must be specified" for GitLab configs with `all` in web configurator. [#512](https://github.com/sourcebot-dev/sourcebot/pull/512)
 - Fixed zoekt indexing failing with pipe in branch/tag names [#506](https://github.com/sourcebot-dev/sourcebot/pull/506)
+- Removed deprecated connection creation/edit UI [#515](https://github.com/sourcebot-dev/sourcebot/pull/515)
 
 ## [4.6.8] - 2025-09-15