Upgrade lerna to version 6.6.2

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ lerna (2.0.0-beta.14 → 6.6.2) · Repo · Changelog

Release Notes

Too many releases to show here. View the full release notes.

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