chore(deps): bump superagent from 5.3.1 to 6.1.0

Bumps [superagent](https://github.com/visionmedia/superagent) from 5.3.1 to 6.1.0.
- [Release notes](https://github.com/visionmedia/superagent/releases)
- [Changelog](https://github.com/visionmedia/superagent/blob/master/HISTORY.md)
- [Commits](ladjs/superagent@v5.3.1...v6.1.0)

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

package.json

@@ -78,7 +78,7 @@
     "serve-favicon": "^2.4.3",
     "serve-static": "^1.14.1",
     "snyk": "^1.385.0",
-    "superagent": "^5.3.1",
+    "superagent": "^6.1.0",
     "swagger-jsdoc": "^4.0.0",
     "swagger-ui-express": "^4.1.4",
     "validator": "^9.1.2"