chore(storybook): bump to v8 release candidate

[daneah]

This change: (check at least one)

• Adds a new feature
• Fixes a bug
• Improves maintainability
• Improves documentation
• Is a release activity

Is this a breaking change? (check one)

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• No

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• Title of this pull request clear, concise, and indicative of the issue number it addresses, if any?
• Test suite(s) passing?
• Code coverage maximal?
• Changeset added?
• Component status page up to date?

What does this change address?

Resolves #710

How does this change work?
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Latest commit: 628043e

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[daneah]

This has been largely subsumed by #716 and will need to be reworked.