fix(sample): fix mongoose sample package json

Author: kamilmysliwiec

sample/14-mongoose-base/package.json

@@ -23,10 +23,6 @@
     "@nestjs/core": "6.11.5",
     "@nestjs/platform-express": "6.11.5",
     "mongoose": "5.8.11",
-    "@nestjs/common": "6.11.4",
-    "@nestjs/core": "6.11.4",
-    "@nestjs/platform-express": "6.11.4",
-    "mongoose": "5.8.11",
     "reflect-metadata": "0.1.13",
     "rimraf": "3.0.1",
     "rxjs": "6.5.4"