fix: upgrade nodemailer from 6.4.14 to 6.9.12

Snyk has created this PR to upgrade nodemailer from 6.4.14 to 6.9.12.

See this package in npm:
https://www.npmjs.com/package/nodemailer

See this project in Snyk:
https://app.snyk.io/org/m8rashidi/project/d6ac0ae4-fc5a-47fb-b858-5f4a05d81990?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -62,7 +62,7 @@
     "moment": "^2.24.0",
     "mongoose": "^5.7.7",
     "morgan": "^1.9.1",
-    "nodemailer": "^6.3.1",
+    "nodemailer": "^6.9.12",
     "passport": "^0.4.0",
     "passport-jwt": "^4.0.0",
     "pm2": "^4.1.2",