build(deps-dev): bump cssnano from 7.0.6 to 8.0.8 (#516)

Bumps [cssnano](https://github.com/cssnano/cssnano) from 7.0.6 to 8.0.8.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@7.0.6...cssnano@8.0.8)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-version: 8.0.4
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Author: dependabot[bot]