chore(deps): update dependency supertest to v6

Author: renovate-bot

package-lock.json

@@ -44,7 +44,7 @@
     "release-it": "14.2.0",
     "rxjs": "6.6.3",
     "rxjs-compat": "6.6.3",
-    "supertest": "5.0.0",
+    "supertest": "6.0.0",
     "ts-jest": "26.4.3",
     "typeorm": "0.2.28",
     "typescript": "4.0.5"