chore(deps): update dependency @types/smtp-server to v3.5.3

Author: renovate-bot

package-lock.json

@@ -66,7 +66,7 @@
     "@types/nodemailer": "6.2.2",
     "@types/promptly": "3.0.0",
     "@types/ramda": "0.26.21",
-    "@types/smtp-server": "3.5.2",
+    "@types/smtp-server": "3.5.3",
     "@types/source-map-support": "0.5.0",
     "@types/stoppable": "1.1.0",
     "@types/supertest": "2.0.8",