simplify MongoDB connection options in server setup

Author: itsleonbro

backend/server.js

@@ -27,10 +27,7 @@ app.use((err, req, res, next) => {
 
 const connectDB = async () => {
   try {
-    await mongoose.connect(process.env.MONGODB_URI, {
-      useNewUrlParser: true,
-      useUnifiedTopology: true,
-    });
+    await mongoose.connect(process.env.MONGODB_URI, {});
     console.log("Connected to MongoDB Atlas");
   } catch (err) {
     console.error("MongoDB connection error:", err);