revert typescript version

Author: davidgamero

package.json

@@ -97,7 +97,7 @@
     "ts-node": "^8.2.0",
     "tslint": "^5.17.0",
     "typedoc": "^0.20.25",
-    "typescript": "^3.9.3"
+    "typescript": "^4.1.3"
   },
   "bugs": {
     "url": "https://github.com/kubernetes-client/javascript/issues"