chore(deps-dev): bump @storybook/client-api

Bumps [@storybook/client-api](https://github.com/storybookjs/storybook/tree/HEAD/lib/client-api) from 6.2.0-rc.8 to 6.2.0-rc.9.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/next/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v6.2.0-rc.9/lib/client-api)

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