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

Author: renovate[bot]

package.json

@@ -100,7 +100,7 @@
     "@kazupon/eslint-config": "^0.38.0",
     "@kazupon/prettier-config": "^0.1.1",
     "@types/node": "^20.11.24",
-    "@types/supertest": "^2.0.12",
+    "@types/supertest": "^6.0.0",
     "@vitest/coverage-v8": "^1.3.0",
     "@vitest/eslint-plugin": "^1.4.0",
     "bumpp": "^9.2.0",