fix(deps): bump nodemailer from 6.9.10 to 6.9.15

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.9.10 to 6.9.15.
- [Release notes](https://github.com/nodemailer/nodemailer/releases)
- [Changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md)
- [Commits](nodemailer/nodemailer@v6.9.10...v6.9.15)

---
updated-dependencies:
- dependency-name: nodemailer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -30,7 +30,7 @@
     "https-proxy-agent": "7.0.5",
     "node-fetch": "2.7.0",
     "node-pushnotifications": "3.1.1",
-    "nodemailer": "6.9.10",
+    "nodemailer": "6.9.15",
     "web-push": "3.6.7",
     "winston": "3.14.2"
   },

yarn.lock

@@ -5452,10 +5452,10 @@ nodemailer-shared@^1.1.0:
   dependencies:
     nodemailer-fetch "1.6.0"
 
-[email protected].10:
-  version "6.9.10"
-  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-6.9.10.tgz#54cc1e062f20726606d3289fcf38ee731aff0d9d"
-  integrity sha512-qtoKfGFhvIFW5kLfrkw2R6Nm6Ur4LNUMykyqu6n9BRKJuyQrqEGwdXXUAbwWEKt33dlWUGXb7rzmJP/p4+O+CA==
+[email protected].15:
+  version "6.9.15"
+  resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-6.9.15.tgz#57b79dc522be27e0e47ac16cc860aa0673e62e04"
+  integrity sha512-AHf04ySLC6CIfuRtRiEYtGEXgRfa6INgWGluDhnxTZhHSKvrBu7lc1VVchQ0d8nPc4cFaZoPq8vkyNoZr0TpGQ==
 
 [email protected]:
   version "3.1.6"