update lerna.json

[luu-alex]

Description

#4888 removing the legacy field from lerna.json
Please include a summary of the changes and be sure to follow our Contribution Guidelines.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist for 1.x:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run dtslint with success and extended the tests and types if necessary.
• I ran npm run test:cov and my test cases cover all the lines and branches of the added code.
• I ran npm run build with success.
• I have tested the built dist/web3.min.js in a browser.
• I have tested my code on the live network.
• I have checked the Deploy Preview and it looks correct.
• I have updated the CHANGELOG.md file in the root folder.

Checklist for 4.x:

• I have selected the correct 4.x base branch.
• Within the description, the feature or issue is discussed in detail or an issue is linked.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas.
• I have added any required tests for the changes I made
• I have made corresponding changes to the documentation
• Any dependent changes have been merged and published in downstream modules.
• I ran yarn successfully
• I ran yarn lint successfully
• I ran yarn build:web successfully
• I ran yarn test:unit successfully
• I ran yarn test:integration successfully
• I ran compile:contracts successfully
• I have tested my code.
• I have updated the corresponding CHANGELOG.md file in the packages I have edited.

[render]

Your Render PR Server URL is https://web3-js-pr-5403.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-cc74k5la4990k53vrnu0.

[coveralls]

Pull Request Test Coverage Report for Build 2958516790

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.235%

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Totals
Change from base Build 2958409825:	0.0%
Covered Lines:	3405
Relevant Lines:	4437

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💛 - Coveralls

[jdevcs]

Pls check Build / e2e (e2e_browsers) (pull_request) before merging into 1.x

[luu-alex]

@jdevcs passed, will merge in