revert typescript version

Author: davidgamero

src/gen/package-lock.json

@@ -17,15 +17,15 @@
     "prepare": "npm run build"
   },
   "dependencies": {
-    "node-fetch": "^2.6.0",
-    "@types/node-fetch": "^2.5.7",
     "@types/node": "*",
-    "form-data": "^2.5.0",
+    "@types/node-fetch": "^2.5.7",
     "btoa": "^1.2.1",
     "es6-promise": "^4.2.4",
+    "form-data": "^2.5.0",
+    "node-fetch": "^2.6.0",
     "url-parse": "^1.4.3"
   },
   "devDependencies": {
-    "typescript": "^3.9.3"
+    "typescript": "^4.1.3"
   }
 }