Revert "chore(deps): update dependency @testing-library/react to v16" (#1107)

This reverts commit 1fb7b96.

Author: awais-ansari

package.json

@@ -70,7 +70,7 @@
     "@edx/reactifex": "2.2.0",
     "@openedx/frontend-build": "14.1.5",
     "@testing-library/jest-dom": "6.5.0",
-    "@testing-library/react": "16.0.1",
+    "@testing-library/react": "12.1.5",
     "glob": "10.4.5",
     "reactifex": "1.1.1",
     "redux-mock-store": "1.5.4"