chore(deps): update storybook monorepo to v6.4.20 (master)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@storybook/addon-actions	6.4.19 -> 6.4.20
@storybook/react	6.4.19 -> 6.4.20

---

Release Notes

storybookjs/storybook

### [`v6.4.20`](https://togithub.com/storybookjs/storybook/releases/v6.4.20) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v6.4.19...v6.4.20) ##### Bug Fixes - CLI: Fix vite/jest issue with mocked global ([#​17830](https://togithub.com/storybookjs/storybook/pull/17830)) - Angular: Fix multiple calls of Input setter ([#​17633](https://togithub.com/storybookjs/storybook/pull/17633)) - Web-components: Fix CSS class usage in CLI template ([#​17702](https://togithub.com/storybookjs/storybook/pull/17702)) - UI: Fix composition support in safari ([#​17679](https://togithub.com/storybookjs/storybook/pull/17679)) - Addon-docs: DocsPage story order should match the index ([#​17669](https://togithub.com/storybookjs/storybook/pull/17669)) - Core: Fix core.builder check ([#​17606](https://togithub.com/storybookjs/storybook/pull/17606)) ##### Maintenance - CLI: Add automigration to `@storybook/builder-vite` ([#​17829](https://togithub.com/storybookjs/storybook/pull/17829))

---

Configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

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

---

This PR has been generated by WhiteSource Renovate. View repository job log here.