small refactor

src/db/services/UserService.ts

@@ -1,6 +1,5 @@
 import { UserModel, IUser } from "../models/user";
 import {connectToDatabase} from "./database.service";
-import mongoose from "mongoose";
 
 export class UserService {
     private static _instance: UserService;

src/db/services/database.service.ts

@@ -5,7 +5,6 @@ import mongoose from "mongoose";
 export async function connectToDatabase() {
     await mongoose.connect(process.env.DB_CONN_STRING!, {
         dbName: process.env.DB_NAME!,
-        serverApi: {version: '1', strict: true, deprecationErrors: true}
     });
 
     console.log("Connected to MongoDB with Mongoose");