npm(deps): bump dotenv from 16.5.0 to 17.2.0 in /backend

Bumps [dotenv](https://github.com/motdotla/dotenv) from 16.5.0 to 17.2.0.
- [Changelog](https://github.com/motdotla/dotenv/blob/master/CHANGELOG.md)
- [Commits](motdotla/dotenv@v16.5.0...v17.2.0)

---
updated-dependencies:
- dependency-name: dotenv
  dependency-version: 17.2.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

backend/package-lock.json

@@ -14,7 +14,7 @@
   "type": "module",
   "dependencies": {
     "cors": "^2.8.5",
-    "dotenv": "^16.5.0",
+    "dotenv": "^17.2.0",
     "express": "^5.1.0",
     "pg": "^8.16.0"
   },