chore(deps): bump nodemailer and @types/nodemailer (#364)

Bumps [nodemailer](https://github.com/nodemailer/nodemailer) and [@types/nodemailer](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/nodemailer). These dependencies needed to be updated together.

Updates `nodemailer` from 6.9.14 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@v6.9.14...v6.9.15)

Updates `@types/nodemailer` from 6.4.15 to 6.4.16
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/nodemailer)

---
updated-dependencies:
- dependency-name: nodemailer
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: "@types/nodemailer"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -48,7 +48,7 @@
     "mime-types": "^2.1.35",
     "mysql2": "^3.11.0",
     "node-cron": "^3.0.3",
-    "nodemailer": "^6.9.14",
+    "nodemailer": "^6.9.15",
     "pdf-generator-client": "github:GEWIS/pdf-generator#04e040b",
     "reflect-metadata": "^0.2.2",
     "sqlite3": "^5.1.7",
@@ -76,7 +76,7 @@
     "@types/mocha": "^10.0.7",
     "@types/node": "^20.16.3",
     "@types/node-cron": "^3.0.11",
-    "@types/nodemailer": "^6.4.15",
+    "@types/nodemailer": "^6.4.16",
     "@types/sinon": "^17.0.3",
     "@types/sinon-chai": "^3.2.12",
     "@types/swagger-ui-express": "^4.1.6",