Remove non-user-facing test fix from CHANGELOG

Co-authored-by: garrytrinder <11563347+garrytrinder@users.noreply.github.com>

Author: Copilot

CHANGELOG.md

@@ -17,7 +17,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed:
 
 - Diagnostics: Language model diagnostic now correctly targets plugins that can use a local language model (OpenAIMockResponsePlugin, OpenApiSpecGeneratorPlugin, TypeSpecGeneratorPlugin) and shows as an informational hint instead of a warning
-- Tests: Fixed test fixture path resolution for Windows compatibility
 
 ## [1.12.0] - 2026-01-29