chore(deps): update dependency @types/nodemailer to v6.4.21

Author: renovate[bot]

package.json

@@ -64,7 +64,7 @@
     "@semantic-release/release-notes-generator": "14.0.3",
     "@types/jest": "29.5.14",
     "@types/node": "20.16.1",
-    "@types/nodemailer": "6.4.15",
+    "@types/nodemailer": "6.4.21",
     "@typescript-eslint/eslint-plugin": "^7.18.0",
     "@typescript-eslint/parser": "^7.18.0",
     "@vercel/ncc": "0.38.3",