Bump web3-utils and web3 in /webapp

Bumps [web3-utils](https://github.com/ChainSafe/web3.js) to 4.2.1 and updates ancestor dependency [web3](https://github.com/ChainSafe/web3.js). These dependencies need to be updated together.


Updates `web3-utils` from 1.8.1 to 4.2.1
- [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...v4.2.1)

Updates `web3` from 1.8.1 to 4.6.0
- [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...v4.6.0)

---
updated-dependencies:
- dependency-name: web3-utils
  dependency-type: indirect
- dependency-name: web3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>