chore(deps): update dependency typescript to v4

Author: renovate-bot

package.json

@@ -89,7 +89,7 @@
     "ts-node": "8.10.2",
     "tslint": "5.20.1",
     "tslint-config-prettier": "1.18.0",
-    "typescript": "3.8.3"
+    "typescript": "4.1.2"
   },
   "husky": {
     "hooks": {