Bump @storybook/theming from 7.6.9 to 7.6.12 in /extensions/ql-vscode (#3309)

Bumps [@storybook/theming](https://github.com/storybookjs/storybook/tree/HEAD/code/lib/theming) from 7.6.9 to 7.6.12.
- [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/v7.6.12/code/lib/theming)

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

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Author: dependabot[bot]

extensions/ql-vscode/package-lock.json

@@ -1982,7 +1982,7 @@
     "@storybook/manager-api": "^7.6.7",
     "@storybook/react": "^7.1.0",
     "@storybook/react-webpack5": "^7.6.7",
-    "@storybook/theming": "^7.6.9",
+    "@storybook/theming": "^7.6.12",
     "@testing-library/dom": "^9.3.4",
     "@testing-library/jest-dom": "^6.2.0",
     "@testing-library/react": "^14.0.0",