Upgrade to React 17

Summary:
Doing some oncall upgrades.

Changelog: Upgrade internal React version to v17

Reviewed By: mweststrate

Differential Revision: D24506315

fbshipit-source-id: 911e4f657684b4d98ec3ef91bc8a81c43130da5b

desktop/plugins/layout/package.json

@@ -14,7 +14,7 @@
     "lodash": "^4.17.19"
   },
   "devDependencies": {
-    "@testing-library/react": "^10.4.3"
+    "@testing-library/react": "^11.1.0"
   },
   "title": "Layout",
   "icon": "target",