Update dependency @testing-library/react to v12

Author: renovate-bot

example/package-lock.json

@@ -6,7 +6,7 @@
     "@ionic/react": "5.6.14",
     "@ionic/react-router": "5.6.14",
     "@testing-library/jest-dom": "5.14.1",
-    "@testing-library/react": "11.2.7",
+    "@testing-library/react": "12.0.0",
     "@testing-library/user-event": "12.8.3",
     "@types/jest": "26.0.24",
     "@types/node": "12.20.19",