Bump @storybook/react from 6.4.19 to 6.4.20

Bumps [@storybook/react](https://github.com/storybookjs/storybook/tree/HEAD/app/react) from 6.4.19 to 6.4.20.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/v6.4.20/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v6.4.20/app/react)

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

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

Author: dependabot[bot]