chore(deps-dev): bump supertest from 4.0.2 to 6.1.3

Bumps [supertest](https://github.com/visionmedia/supertest) from 4.0.2 to 6.1.3.
- [Release notes](https://github.com/visionmedia/supertest/releases)
- [Commits](https://github.com/visionmedia/supertest/compare/v4.0.2...v6.1.3)

Signed-off-by: dependabot[bot] <support@github.com>

plugins/kafka-backend/package.json

@@ -46,7 +46,7 @@
     "@types/jest-when": "^2.7.2",
     "@types/lodash": "^4.14.151",
     "jest-when": "^3.1.0",
-    "supertest": "^4.0.2"
+    "supertest": "^6.1.3"
   },
   "files": [
     "dist",