Bump storybook from 7.6.10 to 7.6.15 in /extensions/ql-vscode (github#3366)

Bumps [storybook](https://github.com/storybookjs/storybook/tree/HEAD/code/lib/cli) from 7.6.10 to 7.6.15.
- [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/v7.6.15/code/lib/cli)

---
updated-dependencies:
- dependency-name: storybook
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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