chore(deps): update dependency @types/nodemailer to v6.4.16

Author: renovate[bot]

package-lock.json

@@ -35,7 +35,7 @@
     "@semantic-release/git": "7.1.0-beta.9",
     "@semantic-release/github": "5.6.0-beta.4",
     "@semantic-release/npm": "6.0.0-beta.4",
-    "@types/nodemailer": "6.2.2",
+    "@types/nodemailer": "6.4.16",
     "semantic-release": "16.0.0-beta.36",
     "prettier": "1.19.1",
     "ts-loader": "6.2.1",