Bump dotenv from 16.6.1 to 17.4.2 in /backend

Bumps [dotenv](https://github.com/motdotla/dotenv) from 16.6.1 to 17.4.2.
- [Changelog](https://github.com/motdotla/dotenv/blob/master/CHANGELOG.md)
- [Commits](https://github.com/motdotla/dotenv/compare/v16.6.1...v17.4.2)

---
updated-dependencies:
- dependency-name: dotenv
  dependency-version: 17.4.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/package.json

@@ -16,7 +16,7 @@
     "bullmq": "^5.1.1",
     "compression": "^1.7.4",
     "cors": "^2.8.5",
-    "dotenv": "^16.3.1",
+    "dotenv": "^17.4.2",
     "express": "^4.18.2",
     "express-async-errors": "^3.1.1",
     "helmet": "^7.1.0",