[Snyk] Security upgrade web3-utils from 1.9.0 to 4.2.1

[3lLobo]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • backend/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	768/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.5	Prototype Pollution SNYK-JS-WEB3UTILS-6229337	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: web3-utils

The new version differs by 250 commits.

• a7bbd7a changelog updates
• 9e5ac81 lerna version bumps
• cf60f71 Fix unstable tests [DRAFT] (#6857)
• edf3164 add eventemitter3 (#6823)
• 040d3a3 fix some typos (#6863)
• ca31f6a EIP6963 web3 provider update event (#6855)
• 8ed041c Research (#6841)
• bd6cc71 Fix bundle stats (#6846)
• 0e59f28 [docs] add stripHexPrefix method to migration guide (#6843)
• ab1b250 fix (#6842)
• b25b883 Update CONTRIBUTING.md (#6838)
• 35cb1b8 ens setAddress support (#6834)
• 86447cd 6201 multi provider (#6825)
• b4c92e1 docs: create resources page (#6824)
• cf4b93f Web3.js Adapter for Wagmi: Documenation (#6813)
• afece40 add link to JSON interface spec docs (#6832)
• 95807a6 fixed broken link in README to point to correct address (#6818)
• a2d9cb4 Completed hardhat/web3v4 tutorial (#6806)
• c5cecaf Enable users to provide feedback page (#6815)
• ec65468 feat: Implement eth.calculateFeeData (#6795)
• f696e47 fix link (#6810)
• e774646 feat: Add getMaxPriorityFeePerGas method (#6748)
• 9023511 Updated README.md (#6804)
• a0d4d2e Resolve test snapshot issue between node 18 vs 20 & 21 (#6794)

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