Bump form-data and web3 in /docs

Removes [form-data](https://github.com/form-data/form-data). It's no longer used after updating ancestor dependency [web3](https://github.com/ChainSafe/web3.js). These dependencies need to be updated together.


Removes `form-data`

Updates `web3` from 1.8.1 to 4.16.0
- [Release notes](https://github.com/ChainSafe/web3.js/releases)
- [Changelog](https://github.com/web3/web3.js/blob/4.x/CHANGELOG.md)
- [Commits](web3/web3.js@v1.8.1...v4.16.0)

---
updated-dependencies:
- dependency-name: form-data
  dependency-version: 
  dependency-type: indirect
- dependency-name: web3
  dependency-version: 4.16.0
  dependency-type: direct:production
...

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Author: dependabot[bot]