chore(deps): update dependency typescript to v4

Author: renovate-bot

package-lock.json

@@ -43,7 +43,7 @@
     "husky": "4.3.8",
     "mocha": "7.2.0",
     "tslint": "5.20.1",
-    "typescript": "3.9.9"
+    "typescript": "4.2.3"
   },
   "dependencies": {
     "amazon-dax-client": "^1.2.2",