fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NODEMAILER-6219989

package.json

@@ -60,7 +60,7 @@
     "titleize": "2",
     "uuid-by-string": "3.0.7",
     "validator": "13.7.0",
-    "zone-mta": "3.3.0"
+    "zone-mta": "3.9.2"
   },
   "devDependencies": {
     "@commitlint/cli": "17.0.2",