Bump mongoose from 5.13.14 to 5.13.15

Bumps [mongoose](https://github.com/Automattic/mongoose) from 5.13.14 to 5.13.15.
- [Release notes](https://github.com/Automattic/mongoose/releases)
- [Changelog](https://github.com/Automattic/mongoose/blob/master/CHANGELOG.md)
- [Commits](Automattic/mongoose@5.13.14...5.13.15)

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

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

Author: dependabot[bot]

package-lock.json

@@ -193,7 +193,7 @@
     "mime": "^3.0.0",
     "mjml": "^3.3.2",
     "mockingoose": "^2.15.2",
-    "mongoose": "^5.13.3",
+    "mongoose": "^5.13.15",
     "nodemailer": "^6.7.3",
     "nodemailer-mailgun-transport": "^2.1.3",
     "passport": "^0.3.2",