Update backend MongoDB dependency version and remove deprecated useUnifiedTopology option

Author: hppanpaliya

mailserver/README.md

@@ -7,7 +7,7 @@ This is a Node.js-based mail server that provides SMTP (Simple Mail Transfer Pro
 Before running the mail server, ensure that you have the following prerequisites installed:
 
 - Node.js (version 14 or higher)
-- MongoDB (running on `mongodb://192.168.1.248:27017`)
+- MongoDB
 - NPM (Node Package Manager)
 
 ## Installation

mailserver/db.js

@@ -5,7 +5,7 @@ let client;
 
 async function connectMongoDB() {
   try {
-    client = new MongoClient(mongoURL, { useUnifiedTopology: true });
+    client = new MongoClient(mongoURL);
     await client.connect();
     console.log("Connected to MongoDB");
   } catch (error) {

mailserver/package.json

@@ -17,10 +17,10 @@
     "emailjs": "^4.0.2",
     "express": "^4.18.2",
     "mailparser": "^3.6.4",
-    "mongodb": "^5.6.0",
+    "mongodb": "^6.7.0",
     "node-cron": "^3.0.3",
     "nodemailer": "^6.9.3",
-    "nodemon": "^2.0.22",
+    "nodemon": "^3.1.4",
     "querystring": "^0.2.1",
     "smtp-server": "^3.12.0",
     "smtpd": "^0.1.7",