Bump formidable and superagent in /extra (#936)

Bumps [formidable](https://github.com/node-formidable/formidable) to 3.5.4 and updates ancestor dependency [superagent](https://github.com/ladjs/superagent). These dependencies need to be updated together.


Updates `formidable` from 2.1.2 to 3.5.4
- [Release notes](https://github.com/node-formidable/formidable/releases)
- [Changelog](https://github.com/node-formidable/formidable/blob/master/CHANGELOG.md)
- [Commits](https://github.com/node-formidable/formidable/commits)

Updates `superagent` from 8.1.2 to 10.2.0
- [Release notes](https://github.com/ladjs/superagent/releases)
- [Changelog](https://github.com/ladjs/superagent/blob/master/HISTORY.md)
- [Commits](forwardemail/superagent@v8.1.2...v10.2.0)

---
updated-dependencies:
- dependency-name: formidable
  dependency-version: 3.5.4
  dependency-type: indirect
- dependency-name: superagent
  dependency-version: 10.2.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

extra/package-lock.json

@@ -11,6 +11,6 @@
   },
   "dependencies": {
     "extract-zip": "^2.0.1",
-    "superagent": "^8.0.9"
+    "superagent": "^10.2.0"
   }
 }