chore(deps): bump nodemailer from 6.7.8 to 6.9.9 in /packages/backend

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.7.8 to 6.9.9.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.7.8...v6.9.9)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/backend/package.json

@@ -76,7 +76,7 @@
 		"multer": "1.4.5-lts.1",
 		"nested-property": "4.0.0",
 		"node-fetch": "3.2.10",
-		"nodemailer": "6.7.8",
+		"nodemailer": "6.9.9",
 		"nsfwjs": "2.4.2",
 		"os-utils": "0.0.14",
 		"parse5": "7.1.1",

packages/backend/yarn.lock

@@ -5534,10 +5534,10 @@ node-gyp@^9.0.0:
     tar "^6.1.2"
     which "^2.0.2"
 
-nodemailer@6.7.8:
-  version "6.7.8"
-  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-6.7.8.tgz#9f1af9911314960c0b889079e1754e8d9e3f740a"
-  integrity sha512-2zaTFGqZixVmTxpJRCFC+Vk5eGRd/fYtvIR+dl5u9QXLTQWGIf48x/JXvo58g9sa0bU6To04XUv554Paykum3g==
+nodemailer@6.9.9:
+  version "6.9.9"
+  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-6.9.9.tgz#4549bfbf710cc6addec5064dd0f19874d24248d9"
+  integrity sha512-dexTll8zqQoVJEZPwQAKzxxtFn0qTnjdQTchoU6Re9BUUGBJiOy3YMn/0ShTW6J5M0dfQ1NeDeRTTl4oIWgQMA==
 
 nofilter@^2.0.3:
   version "2.0.3"