chore(deps): update dependency @testing-library/react to v12

Author: renovate-bot

snowpack-react/package-lock.json

@@ -30,7 +30,7 @@
     "@snowpack/plugin-dotenv": "2.1.0",
     "@snowpack/plugin-react-refresh": "2.5.0",
     "@snowpack/web-test-runner-plugin": "0.2.2",
-    "@testing-library/react": "11.2.7",
+    "@testing-library/react": "12.0.0",
     "@web/test-runner": "0.13.12",
     "chai": "4.3.4",
     "prettier": "2.3.1",