Bump @storybook/addon-controls from 6.4.20 to 6.4.21
Bump @storybook/addon-controls from 6.4.20 to 6.4.21

Bumps [@storybook/addon-controls](https://github.com/storybookjs/storybook/tree/HEAD/addons/controls) from 6.4.20 to 6.4.21.
- [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/v6.4.21/addons/controls)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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