chore(deps): update dependency supertest to v7

Author: renovate[bot]

packages/backend/package.json

@@ -118,7 +118,7 @@
     "eslint-plugin-jest": "24.7.0",
     "jest": "27.5.1",
     "jest-runner-eslint": "0.11.1",
-    "supertest": "6.3.3",
+    "supertest": "7.1.4",
     "ts-jest": "27.1.5",
     "ts-loader": "9.4.1",
     "ts-node": "10.9.1",