Update dependency cross-env to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cross-env	6.0.3 -> 7.0.3

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Release Notes

kentcdodds/cross-env (cross-env)

v7.0.3

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Bug Fixes

• add maintenance mode notice (fe80c84)

v7.0.2

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Reverts

• Revert "fix: signal handling (#​227)" (2a1f44c), closes #​227

v7.0.1

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Bug Fixes

• signal handling (#​227) (8a9cf0e)

v7.0.0

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Features

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

BREAKING CHANGES

• Drop Node 8 support

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