build(deps): bump postcss-selector-parser from 7.0.0 to 7.1.1 (#1404)

Bumps [postcss-selector-parser](https://github.com/postcss/postcss-selector-parser) from 7.0.0 to 7.1.1.
- [Release notes](https://github.com/postcss/postcss-selector-parser/releases)
- [Changelog](https://github.com/postcss/postcss-selector-parser/blob/master/CHANGELOG.md)
- [Commits](postcss/postcss-selector-parser@v7.0.0...v7.1.1)

---
updated-dependencies:
- dependency-name: postcss-selector-parser
  dependency-version: 7.1.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]