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

Author: renovate[bot]

package.json

@@ -27,7 +27,7 @@
     "typenexus": "0.5.6"
   },
   "devDependencies": {
-    "@types/supertest": "~2.0.12",
+    "@types/supertest": "~6.0.0",
     "nodemon": "^2.0.20",
     "supertest": "^6.3.3",
     "supertest-session": "^5.0.0",