Update dependency shelljs to v0.8.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
shelljs	dependencies	patch	0.8.3 -> 0.8.4

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Release Notes

shelljs/shelljs

### [`v0.8.4`](https://togithub.com/shelljs/shelljs/releases/v0.8.4) [Compare Source](https://togithub.com/shelljs/shelljs/compare/v0.8.3...v0.8.4) Small patch release to fix a circular dependency warning in node v14. See [#​973](https://togithub.com/shelljs/shelljs/issues/973).

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