Update dependency cross-env to v7

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
cross-env	devDependencies	major	^7.0.0	source

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Release Notes

kentcdodds/cross-env

v7.0.0

Compare Source

Features

• update dependencies (#​223) (4ec6f40)

BREAKING CHANGES

• Drop Node 8 support

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