chore(deps): update @testing-library/jest-dom to v6.9.1 (#2262)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -82,7 +82,7 @@
     "@primer/primitives": "11.2.0",
     "@primer/react": "37.31.0",
     "@tailwindcss/postcss": "4.1.13",
-    "@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/jest": "30.0.0",