Bump @primer/css from 21.5.1 to 22.0.0

Bumps [@primer/css](https://github.com/primer/css) from 21.5.1 to 22.0.0.
- [Release notes](https://github.com/primer/css/releases)
- [Changelog](https://github.com/primer/css/blob/main/CHANGELOG.md)
- [Commits](primer/css@v21.5.1...v22.0.0)

---
updated-dependencies:
- dependency-name: "@primer/css"
  dependency-version: 22.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]