chore(deps): update dependency stylus to v0.56.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylus	0.55.0 -> 0.56.0

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Release Notes

stylus/stylus

### [`v0.56.0`](https://togithub.com/stylus/stylus/blob/HEAD/Changelog.md#​0560--2021-12-18) [Compare Source](https://togithub.com/stylus/stylus/compare/0.55.0...0.56.0) \=================== - Deps: upgrade debug version from v3 to v4. [#​2643](https://togithub.com/stylus/stylus/pull/2643) - Deps: remove dependencies semver and mkdirp. [2641](https://togithub.com/stylus/stylus/pull/2641) - Fix: variable names beginning with a keyword and dash. [#​2634](https://togithub.com/stylus/stylus/pull/2634) - Fix: [@​import](https://togithub.com/import) url() error in dependency resolver. [#​2632](https://togithub.com/stylus/stylus/pull/2632)

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