chore(deps): bump nodemailer from 6.7.5 to 6.7.7 in /install

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) from 6.7.5 to 6.7.7.
- [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/v6.7.5...v6.7.7)

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

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

install/package.json

@@ -101,7 +101,7 @@
         "nodebb-theme-slick": "2.0.2",
         "nodebb-theme-vanilla": "12.1.18",
         "nodebb-widget-essentials": "6.0.0",
-        "nodemailer": "6.7.5",
+        "nodemailer": "6.7.7",
         "nprogress": "0.2.0",
         "passport": "0.5.2",
         "passport-http-bearer": "1.0.1",