fix: upgrade supertest from 7.1.3 to 7.1.4

Snyk has created this PR to upgrade supertest from 7.1.3 to 7.1.4.

See this package in npm:
supertest

See this project in Snyk:
https://app.snyk.io/org/nodeshift-agg/project/0865fbfa-c5be-44cc-ab70-e2f03f8f4eb1?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

backend/package-lock.json

@@ -24,7 +24,7 @@
     "mocha": "^11.7.1",
     "mongodb-memory-server": "^10.1.3",
     "nyc": "^17.0.0",
-    "supertest": "^7.1.3"
+    "supertest": "^7.1.4"
   },
   "support": true
 }