Bump @storybook/addon-themes from 7.6.4 to 7.6.11 in /storybook

Bumps [@storybook/addon-themes](https://github.com/storybookjs/storybook/tree/HEAD/code/addons/themes) from 7.6.4 to 7.6.11.
- [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/v7.6.11/code/addons/themes)

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

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

storybook/package.json

@@ -14,7 +14,7 @@
     "@storybook/addon-essentials": "^7.6.4",
     "@storybook/addon-interactions": "^7.6.4",
     "@storybook/addon-links": "^7.6.4",
-    "@storybook/addon-themes": "^7.6.4",
+    "@storybook/addon-themes": "^7.6.11",
     "@storybook/blocks": "^7.6.4",
     "@storybook/react": "^7.6.4",
     "@storybook/react-vite": "^7.6.4",