deps-dev(deps-dev): bump @storybook/addon-onboarding from 9.0.6 to 9.0.8

Bumps [@storybook/addon-onboarding](https://github.com/storybookjs/storybook/tree/HEAD/code/addons/onboarding) from 9.0.6 to 9.0.8.
- [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/v9.0.8/code/addons/onboarding)

---
updated-dependencies:
- dependency-name: "@storybook/addon-onboarding"
  dependency-version: 9.0.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]