chore(deps): update @testing-library/jest-dom to v6.8.0

Author: renovate[bot]

package.json

@@ -84,7 +84,7 @@
     "@primer/primitives": "11.1.0",
     "@primer/react": "36.27.0",
     "@tailwindcss/postcss": "4.1.12",
-    "@testing-library/jest-dom": "6.7.0",
+    "@testing-library/jest-dom": "6.8.0",
     "@testing-library/react": "16.3.0",
     "@testing-library/user-event": "14.6.1",
     "@types/jest": "30.0.0",