Bump web3-utils from 1.0.0-beta.36 to 1.2.1 in /desktop/js_files

Bumps [web3-utils](https://github.com/ethereum/web3.js) from 1.0.0-beta.36 to 1.2.1.
- [Release notes](https://github.com/ethereum/web3.js/releases)
- [Changelog](https://github.com/ethereum/web3.js/blob/v1.2.1/CHANGELOG.md)
- [Commits](web3/web3.js@v1.0.0-beta.36...v1.2.1)

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