Update dependency gulp-clean-css to v3.9.3 - autoclosed

[renovate[bot]]

This Pull Request updates dependency gulp-clean-css from v3.9.2 to v3.9.3

Release Notes

### [`v3.9.3`](https://github.com/scniro/gulp-clean-css/releases/3.9.3) - [#​57](`https://github.com/scniro/gulp-clean-css/issues/57`) ---

Commits

#### v3.9.3 - [`4d8330d`](https://github.com/scniro/gulp-clean-css/commit/4d8330da735955fb33d0f8b3610041aeb96a5129) remove codeclimate - [`8479e19`](https://github.com/scniro/gulp-clean-css/commit/8479e19385de349e740a5dceb01e73a43de6401c) #​57, deps

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This PR has been generated by Renovate Bot.

[openjck]

r+ pending Circle