chore(deps-dev): bump @storybook/addons from 6.1.20 to 6.1.21

Bumps [@storybook/addons](https://github.com/storybookjs/storybook/tree/HEAD/lib/addons) from 6.1.20 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/lib/addons)

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

package.json

@@ -69,7 +69,7 @@
     "@storybook/addon-links": "^6.1.20",
     "@storybook/addon-storysource": "^6.1.21",
     "@storybook/addon-viewport": "^6.1.21",
-    "@storybook/addons": "^6.1.20",
+    "@storybook/addons": "^6.1.21",
     "@storybook/preset-ant-design": "0.0.1",
     "@storybook/preset-create-react-app": "^3.1.6",
     "@storybook/preset-typescript": "^3.0.0",