chore(deps-dev): bump @storybook/addon-actions from 6.1.18 to 6.1.21

Bumps [@storybook/addon-actions](https://github.com/storybookjs/storybook/tree/HEAD/addons/actions) from 6.1.18 to 6.1.21.
- [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/v6.1.21/addons/actions)

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