build(deps): bump superagent from 5.1.1 to 6.0.0 in /Server

Bumps [superagent](https://github.com/visionmedia/superagent) from 5.1.1 to 6.0.0.
- [Release notes](https://github.com/visionmedia/superagent/releases)
- [Changelog](https://github.com/visionmedia/superagent/blob/master/HISTORY.md)
- [Commits](https://github.com/visionmedia/superagent/compare/v5.1.1...v6.0.0)

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

Server/package.json

@@ -33,7 +33,7 @@
     "pm2": "^4.4.0",
     "sequelize": "^5.21.2",
     "socket.io": "^2.3.0",
-    "superagent": "^5.1.1",
+    "superagent": "^6.0.0",
     "uuid": "^3.3.3"
   },
   "devDependencies": {