chore: update CHANGELOG for #1039

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: brendan-kellam

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 - Fixed line numbers being selectable in Safari in the lightweight code highlighter. [#1037](https://github.com/sourcebot-dev/sourcebot/pull/1037)
+- Fixed GitLab sync deleting repos when the API returns a non-404 error (e.g. 500) during group/user/project fetch. [#1039](https://github.com/sourcebot-dev/sourcebot/pull/1039)
 
 ### Added
 - Added optional copy button to the lightweight code highlighter (`isCopyButtonVisible` prop), shown on hover. [#1037](https://github.com/sourcebot-dev/sourcebot/pull/1037)