chore(deps-dev): bump storybook from 8.6.0 to 8.6.15

Bumps [storybook](https://github.com/storybookjs/storybook/tree/HEAD/code/core) from 8.6.0 to 8.6.15.
- [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/v8.6.15/code/core)

---
updated-dependencies:
- dependency-name: storybook
  dependency-version: 8.6.15
  dependency-type: direct:development
...

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

package.json

@@ -142,7 +142,7 @@
         "prettier": "3.6.2",
         "react-dev-utils": "^12.0.1",
         "semantic-release": "^24.2.3",
-        "storybook": "^8.6.0",
+        "storybook": "^8.6.15",
         "typescript": "^5.7.3",
         "unocss": "^0.63.6",
         "unocss-preset-primitives": "0.0.2-beta.1",