chore(deps-dev): bump @storybook/theming from 8.6.10 to 8.6.12

Bumps [@storybook/theming](https://github.com/storybookjs/storybook/tree/HEAD/code/lib/theming) from 8.6.10 to 8.6.12.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Commits](https://github.com/storybookjs/storybook/commits/v8.6.12/code/lib/theming)

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

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

Author: dependabot[bot]

packages/react-google-charts/package.json

@@ -59,7 +59,7 @@
     "@storybook/manager-api": "^8.4.4",
     "@storybook/react": "^8.4.4",
     "@storybook/react-webpack5": "^8.4.4",
-    "@storybook/theming": "^8.4.4",
+    "@storybook/theming": "^8.6.12",
     "@swc/helpers": "^0.5.13",
     "@swc/jest": "^0.2.37",
     "@testing-library/jest-dom": "^6.5.0",