chore(deps-dev): bump @storybook/html from 6.1.14 to 6.1.15 (#261)

Bumps [@storybook/html](https://github.com/storybookjs/storybook/tree/HEAD/app/html) from 6.1.14 to 6.1.15.
- [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/v6.1.15/app/html)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]