chore(deps): update dependency @storybook/theming to v6 - autoclosed

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@storybook/theming (source)	devDependencies	major	^5.3.22 -> ^6.0.0

By merging this PR, the below vulnerabilities will be automatically resolved:

Severity	CVSS Score	CVE
Medium	5.3	CVE-2022-41713

---

Release Notes

storybookjs/storybook

### [`v6.0.0`](https://togithub.com/storybookjs/storybook/releases/tag/v6.0.0) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v5.3.22...v6.0.0) Storybook 6.0 is here! - 📣 [Release post](https://medium.com/storybookjs/storybook-6-0-1e14a2071000) - ⏫ [Migration guide](https://medium.com/storybookjs/storybook-6-migration-guide-200346241bb5) Key features: - 💎 [Essentials: Zero-configuration setup](https://medium.com/storybookjs/zero-config-storybook-66e7c4798e5d) - 🧬 [Args: Next-generation, dynamic story format](https://medium.com/storybookjs/introducing-storybook-args-2dadcdb777cc) - 🎛 [Controls: Live edit component examples](https://medium.com/storybookjs/storybook-controls-ce82af93e430) - 🌐 [Composition: Combine multiple Storybooks](https://medium.com/storybookjs/storybook-composition-af0da9084fba) - 📚 [Documentation: Complete project overhaul](https://storybook.js.org/docs/) 6.0 contains hundreds more fixes, features, and tweaks. Browse the changelogs matching `6.0.0-alpha.*`, `6.0.0-beta.*`, and `6.0.0-rc.*` for the full list of changes. See [MIGRATION.md](https://togithub.com/storybookjs/storybook/blob/next/MIGRATION.md) to upgrade from `5.3` or earlier.

---

• [ ] If you want to rebase/retry this PR, click this checkbox.