chore(deps-dev): bump storybook in /packages/neuron-ui

Bumps [storybook](https://github.com/storybookjs/storybook/tree/HEAD/code/core) from 8.6.14 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>

Author: dependabot[bot]

packages/neuron-ui/package.json

@@ -105,7 +105,7 @@
     "jest-styled-components": "7.2.0",
     "jsdom": "26.0.0",
     "postcss-preset-env": "10.1.6",
-    "storybook": "8.6.14",
+    "storybook": "8.6.15",
     "storybook-addon-react-router-v6": "2.0.10",
     "terser": "5.39.2",
     "vite": "6.3.6",