chore(deps): update dependency @testing-library/dom to v9.3.3

Author: renovate[bot]

package-lock.json

@@ -38,7 +38,7 @@
     "@edx/frontend-build": "12.9.10",
     "@edx/frontend-platform": "5.3.2",
     "@edx/reactifex": "^2.1.1",
-    "@testing-library/dom": "9.3.1",
+    "@testing-library/dom": "9.3.3",
     "@testing-library/jest-dom": "5.17.0",
     "@testing-library/react": "10.4.9",
     "@wojtekmaj/enzyme-adapter-react-17": "0.8.0",