chore(deps): update dependency @testing-library/jest-dom to v6

Author: renovate[bot]

package-lock.json

@@ -37,7 +37,7 @@
     "@openedx/frontend-build": "^14.3.2",
     "@openedx/paragon": "^23.0.0",
     "@testing-library/dom": "^10.4.0",
-    "@testing-library/jest-dom": "5.17.0",
+    "@testing-library/jest-dom": "6.9.1",
     "@testing-library/react": "^16.2.0",
     "jest": "30.2.0",
     "jest-environment-jsdom": "^30.0.0",