Update dependency postcss-combine-duplicated-selectors to v8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
postcss-combine-duplicated-selectors	devDependencies	major	7.0.0 -> 8.0.2

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Release Notes

ChristianMurphy/postcss-combine-duplicated-selectors

### [`v8.0.2`](https://togithub.com/ChristianMurphy/postcss-combine-duplicated-selectors/compare/v8.0.1...v8.0.2) [Compare Source](https://togithub.com/ChristianMurphy/postcss-combine-duplicated-selectors/compare/v8.0.1...v8.0.2) ### [`v8.0.1`](https://togithub.com/ChristianMurphy/postcss-combine-duplicated-selectors/compare/v8.0.0...v8.0.1) [Compare Source](https://togithub.com/ChristianMurphy/postcss-combine-duplicated-selectors/compare/v8.0.0...v8.0.1) ### [`v8.0.0`](https://togithub.com/ChristianMurphy/postcss-combine-duplicated-selectors/releases/v8.0.0) [Compare Source](https://togithub.com/ChristianMurphy/postcss-combine-duplicated-selectors/compare/v7.0.0...v8.0.0) drops support for Node 6

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