fix(security): remediate NoSQL injection vulnerability (bug S5147)

Co-Authored-By: Joao Esteves <joao.esteves@cognition.ai>

Author: devin-ai-integration[bot]

routes/index.js

@@ -36,7 +36,9 @@ exports.index = function (req, res, next) {
 
 exports.loginHandler = function (req, res, next) {
   if (validator.isEmail(req.body.username)) {
-    User.find({ username: req.body.username, password: req.body.password }, function (err, users) {
+    var username = String(req.body.username);
+    var password = String(req.body.password);
+    User.find({ username: username, password: password }, function (err, users) {
       if (users.length > 0) {
         const redirectPage = req.body.redirectPage
         const session = req.session