Chore(deps): Bump postcss-selector-parser and @nextcloud/eslint-config

Bumps [postcss-selector-parser](https://github.com/postcss/postcss-selector-parser) to 7.1.6 and updates ancestor dependency [@nextcloud/eslint-config](https://github.com/nextcloud-libraries/eslint-config). These dependencies need to be updated together.


Updates `postcss-selector-parser` from 7.1.5 to 7.1.6
- [Release notes](https://github.com/postcss/postcss-selector-parser/releases)
- [Changelog](https://github.com/postcss/postcss-selector-parser/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss-selector-parser@7.1.5...7.1.6)

Updates `@nextcloud/eslint-config` from 8.4.2 to 9.0.1
- [Release notes](https://github.com/nextcloud-libraries/eslint-config/releases)
- [Changelog](https://github.com/nextcloud-libraries/eslint-config/blob/main/CHANGELOG.md)
- [Commits](nextcloud-libraries/eslint-config@v8.4.2...v9.0.1)

---
updated-dependencies:
- dependency-name: "@nextcloud/eslint-config"
  dependency-version: 9.0.1
  dependency-type: direct:development
- dependency-name: postcss-selector-parser
  dependency-version: 7.1.6
  dependency-type: indirect
...

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Author: dependabot[bot]