Update dependency gutenberg-css to ^0.7.0

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gutenberg-css	^0.6.1 -> ^0.7.0

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Release Notes

BafS/Gutenberg (gutenberg-css)

### [`v0.7.0`](https://togithub.com/BafS/Gutenberg/releases/tag/v0.7.0): Version 0.7.0 [Compare Source](https://togithub.com/BafS/Gutenberg/compare/v0.6.1...v0.7.0) #### What's Changed - deprecation(Division): Migrate away from slash based division. by [@​tomciopp](https://togithub.com/tomciopp) in [https://github.com/BafS/Gutenberg/pull/32](https://togithub.com/BafS/Gutenberg/pull/32) - Upgrade gulp-sass to v5 by [@​BafS](https://togithub.com/BafS) in [https://github.com/BafS/Gutenberg/pull/38](https://togithub.com/BafS/Gutenberg/pull/38) #### New Contributors - [@​tomciopp](https://togithub.com/tomciopp) made their first contribution in [https://github.com/BafS/Gutenberg/pull/32](https://togithub.com/BafS/Gutenberg/pull/32) - [@​BafS](https://togithub.com/BafS) made their first contribution in [https://github.com/BafS/Gutenberg/pull/38](https://togithub.com/BafS/Gutenberg/pull/38) **Full Changelog**: https://github.com/BafS/Gutenberg/compare/v0.6.1...v0.7.0

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