chore(deps): update dependency lerna to v6

This MR contains the following updates:

Package	Type	Update	Change
lerna (source)	devDependencies	major	^5.0.0 -> ^6.0.0

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Release Notes

lerna/lerna

v6.0.1

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Bug Fixes

• run: allow for loading of env files to be skipped (#​3375) (5dbd904)

v6.0.0

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Note: Version bump only for package lerna

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