Bump storybook from 7.6.10 to 7.6.21 (#142)

Bumps [storybook](https://github.com/storybookjs/storybook/tree/HEAD/code/core) from 7.6.10 to 7.6.21.
- [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/v7.6.21/code/core)

---
updated-dependencies:
- dependency-name: storybook
  dependency-version: 7.6.21
  dependency-type: direct:development
...

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package.json

@@ -123,7 +123,7 @@
     "react-refresh": "^0.14.0",
     "rimraf": "^4.1.3",
     "sass": "^1.77.0",
-    "storybook": "^7.3.2",
+    "storybook": "^7.6.21",
     "tailwindcss": "^3.4.1",
     "tui-jsdoc-template": "^1.2.2",
     "typescript": "^5.1.6"