chore: bump cssnano from 8.0.2 to 9.0.1

Bumps [cssnano](https://github.com/cssnano/cssnano) from 8.0.2 to 9.0.1.
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/cssnano@8.0.2...cssnano@9.0.1)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-version: 9.0.1
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]