fix: remove unused pg package

Author: ShGKme

package-lock.json

@@ -38,7 +38,6 @@
     "nestjs-mikro-orm": "^1.0.3",
     "passport": "^0.4.1",
     "passport-local": "^1.0.0",
-    "pg": "^8.0.0",
     "reflect-metadata": "^0.1.13",
     "rimraf": "^3.0.2",
     "rxjs": "^6.5.4",