build(deps-dev): bump @testing-library/jest-dom from 6.8.0 to 6.9.1 in /frontend (#5100)

Author: sandhose

frontend/package-lock.json

@@ -51,7 +51,7 @@
     "@tanstack/react-query-devtools": "^5.90.2",
     "@tanstack/react-router-devtools": "^1.131.44",
     "@tanstack/router-plugin": "^1.131.44",
-    "@testing-library/jest-dom": "^6.8.0",
+    "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.0",
     "@testing-library/user-event": "^14.6.1",
     "@types/node": "^24.7.0",