Update dependency cross-env to v7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cross-env	5.2.1 -> 7.0.3

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Release Notes

kentcdodds/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

v6.0.3

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Bug Fixes

• do not compile anything (67f21c3)

v6.0.2

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Bug Fixes

• table of contents in README (a825e9c)

v6.0.1

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Bug Fixes

• update all packages, tests, and README (36bb6c3)

v6.0.0

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Bug Fixes

• bumped cross-spawn to version 7.0.0 (#​211) (61ebf59)

BREAKING CHANGES

• Drop support for Node.js < 7.

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