chore(deps): update dependency stylus to v0.55.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylus	0.54.8 -> 0.55.0

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Release Notes

stylus/stylus

### [`v0.55.0`](https://togithub.com/stylus/stylus/blob/master/Changelog.md#​0550--2021-09-04) [Compare Source](https://togithub.com/stylus/stylus/compare/0.54.8...0.55.0) \=================== - Fearure: Add deg and fr as exceptions for 0 value unit omission. [#​2578](https://togithub.com/stylus/stylus/pull/2578) - Feature: Add inverse trigonometric functions as bifs. [#​2186](https://togithub.com/stylus/stylus/pull/2186) closes [#​1567](https://togithub.com/stylus/stylus/issues/1567) - Fix: Bug fixes of encoding png image in url lib function. [#​2549](https://togithub.com/stylus/stylus/pull/2549) - Refactoring: Replace dependency css-parse with css. [#​2554](https://togithub.com/stylus/stylus/pull/2554)

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