chore(deps): update dependency @types/supertest to v6

Author: renovate[bot]

apps/backend/package.json

@@ -67,7 +67,7 @@
     "@types/passport": "^1.0.16",
     "@types/passport-jwt": "^3.0.13",
     "@types/passport-oauth2": "^1.4.15",
-    "@types/supertest": "^2.0.16",
+    "@types/supertest": "^6.0.2",
     "jest": "^29.7.0",
     "rimraf": "^5.0.5",
     "source-map-support": "^0.5.21",