Bump nodemailer from 5.1.1 to 6.9.9

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 5.1.1 to 6.9.9.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nodemailer/nodemailer/compare/v5.1.1...v6.9.9)

---
updated-dependencies:
- dependency-name: nodemailer
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -23,7 +23,7 @@
         "mnemonist": "^0.27.2",
         "moment": "^2.24.0",
         "morgan": "~1.9.0",
-        "nodemailer": "^5.1.1",
+        "nodemailer": "^6.9.9",
         "p-series": "^2.0.0",
         "random-word": "^2.0.0",
         "sanitize-html": "^1.20.0",
@@ -4670,9 +4670,9 @@
       }
     },
     "node_modules/nodemailer": {
-      "version": "5.1.1",
+      "version": "6.9.9",
-      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-5.1.1.tgz",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.9.9.tgz",
-      "integrity": "sha512-hKGCoeNdFL2W7S76J/Oucbw0/qRlfG815tENdhzcqTpSjKgAN91mFOqU2lQUflRRxFM7iZvCyaFcAR9noc/CqQ==",
+      "integrity": "sha512-dexTll8zqQoVJEZPwQAKzxxtFn0qTnjdQTchoU6Re9BUUGBJiOy3YMn/0ShTW6J5M0dfQ1NeDeRTTl4oIWgQMA==",
       "engines": {
         "node": ">=6.0.0"
       }

package.json

@@ -23,7 +23,7 @@
     "mnemonist": "^0.27.2",
     "moment": "^2.24.0",
     "morgan": "~1.9.0",
-    "nodemailer": "^5.1.1",
+    "nodemailer": "^6.9.9",
     "p-series": "^2.0.0",
     "random-word": "^2.0.0",
     "sanitize-html": "^1.20.0",