chore(deps): update dependency typescript to v4

Author: renovate-bot

package-lock.json

@@ -37,7 +37,7 @@
     "tslint-config-prettier": "1.18.0",
     "tslint-react": "4.2.0",
     "tsutils": "3.17.1",
-    "typescript": "3.8.2"
+    "typescript": "4.3.5"
   },
   "optionalDependencies": {},
   "engines": {