chore: add missing webui changelog entry

Author: netomi

webui/CHANGELOG.md

@@ -10,6 +10,7 @@ This change log covers only the frontend library (webui) of Open VSX.
 
 ### Changed
 
+- Migrate admin dashboard to use `@tanstack/react-query` ([#1917](https://github.com/eclipse-openvsx/openvsx/pull/1917)
 - Replace formatting from `stylistic` with `prettier` ([#1916](https://github.com/eclipse-openvsx/openvsx/pull/1916))
 
 ## [v1.0.2] (23/06/2026)