Update dependency typescript to v4

Author: renovate-bot

Diff for: package.json

@@ -42,6 +42,6 @@
     "react": "16.13.1",
     "react-native": "0.63.0",
     "typedoc": "0.18.0",
-    "typescript": "3.9.7"
+    "typescript": "4.0.3"
   }
 }