chore: add CHANGELOG entry for postcss-selector-parser upgrade

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: claude[bot]

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Added a live repository indexing job runtime to the syncing badge. [#1623](https://github.com/sourcebot-dev/sourcebot/pull/1623)
 
+### Fixed
+- Upgraded `postcss-selector-parser` to `^6.1.4`. [#1625](https://github.com/sourcebot-dev/sourcebot/pull/1625)
+
 ## [5.1.10] - 2026-08-27
 
 ### Fixed