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

[renovate]

This PR contains the following updates:

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

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Release Notes

storybookjs/storybook

v6.4.20

Compare Source

Bug Fixes

• CLI: Fix vite/jest issue with mocked global (#​17830)
• Angular: Fix multiple calls of Input setter (#​17633)
• Web-components: Fix CSS class usage in CLI template (#​17702)
• UI: Fix composition support in safari (#​17679)
• Addon-docs: DocsPage story order should match the index (#​17669)
• Core: Fix core.builder check (#​17606)

Maintenance

• CLI: Add automigration to @storybook/builder-vite (#​17829)

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