Updated nodemailer version

package.json

@@ -11,7 +11,7 @@
     "memory-cache": "^0.2.0",
     "mysql": "^2.16.0",
     "node-pandoc": "^0.3.0",
-    "nodemailer": "^4.6.8",
+    "nodemailer": ">6.4.16",
     "nodemailer-smtp-transport": "^2.7.4",
     "promise": "^8.0.1",
     "request": "^2.88.0",