Update dependency gulp-rtlcss to v2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gulp-rtlcss	^1.4.1 -> ^2.0.0

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Release Notes

jjlharrison/gulp-rtlcss (gulp-rtlcss)

### [`v2.0.0`](https://togithub.com/jjlharrison/gulp-rtlcss/blob/HEAD/CHANGELOG.md#200---2022-04-01) [Compare Source](https://togithub.com/jjlharrison/gulp-rtlcss/compare/4cf4abbd5eeee2a849244a09d80c0a39ade88645...v2.0.0) - Upgrade to RTLCSS to 3.5.0

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Configuration

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