build(deps): bump nodemailer from 6.4.6 to 6.4.8

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.4.6 to 6.4.8.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.4.6...v6.4.8)

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

Author: dependabot-preview[bot]

package.json

@@ -70,7 +70,7 @@
     "mysql2": "^2.1.0",
     "nconf": "^0.10.0",
     "netease-music-sdk": "^0.3.1",
-    "nodemailer": "^6.4.6",
+    "nodemailer": "^6.4.8",
     "passthrough-counter": "^1.0.0",
     "pify": "^5.0.0",
     "redis": "^3.0.2",

yarn.lock

@@ -4728,10 +4728,10 @@ node-notifier@^7.0.0:
     uuid "^7.0.3"
     which "^2.0.2"
 
-nodemailer@^6.4.6:
-  version "6.4.6"
-  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-6.4.6.tgz#d37f504f6560b36616f646a606894fe18819107f"
-  integrity sha512-/kJ+FYVEm2HuUlw87hjSqTss+GU35D4giOpdSfGp7DO+5h6RlJj7R94YaYHOkoxu1CSaM0d3WRBtCzwXrY6MKA==
+nodemailer@^6.4.8:
+  version "6.4.8"
+  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-6.4.8.tgz#aca52886e4e56f71f6b8a65f5ca6b767ca751fc7"
+  integrity sha512-UbJD0+g5e2H20bWv7Rpj3B+N3TMMJ0MLoLwaGVJ0k3Vo8upq0UltwHJ5BJfrpST1vFa91JQ8cf7cICK5DSIo1Q==
 
 normalize-package-data@^2.3.2, normalize-package-data@^2.3.4, normalize-package-data@^2.5.0:
   version "2.5.0"