chore: Update storybook monorepo to v6.4.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@storybook/addon-actions	6.4.3 -> 6.4.9
@storybook/addon-essentials	6.4.3 -> 6.4.9
@storybook/addon-links	6.4.3 -> 6.4.9
@storybook/builder-webpack5	6.4.3 -> 6.4.9
@storybook/html	6.4.3 -> 6.4.9
@storybook/manager-webpack5	6.4.3 -> 6.4.9

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Release Notes

storybookjs/storybook

v6.4.9

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Bug Fixes

• Core: Ensure we have a full story index before caching (#​16947)
• Angular: Fix support for non-roman alphabets in story titles (#​16931)
• Core: Be explicit about viewMode to fix Vue issue (#​16919)
• Core: Remove unused and occluded types (#​16917)

v6.4.8

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Bug Fixes

• Core: Fix auto-title in webpack5 (#​16913)
• CLI: Fix sb repro clobbering .vuerc (#​16897)

Maintenance

• Core: Add feature flag to disable legacy hierarchy separator warning (#​16915)

v6.4.7

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Bug Fixes

• Angular: Fix incorrect log (#​16885)

v6.4.5

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Bug Fixes

• Angular: Fix tsConfig paths not resolving for Angular >=12.2 (#​16882)
• Addon-docs: Fix transclusion crash on webpack rules without test field (#​16873)

Dependency Upgrades

• Bump lodash to 4.17.21 (#​16883)

v6.4.4

Compare Source

Bug Fixes

• CLI: Fix mainjsFramework automigrate (#​16866)

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