Bump @storybook/builder-webpack5 in /extensions/ql-vscode (#2320)

Bumps [@storybook/builder-webpack5](https://github.com/storybookjs/storybook/tree/HEAD/lib/core) from 6.5.17-alpha.0 to 7.0.4.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Commits](https://github.com/storybookjs/storybook/commits/v7.0.4/lib/core)

---
updated-dependencies:
- dependency-name: "@storybook/builder-webpack5"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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