Pin cssnano-simple to 3.0.0

[wlee221]

Description of changes

Docs CI has been failing due to a bug in cssnano-simple: vercel/next.js#35267. Pinning to 3.0.0.

Issue #, if available

Description of how you validated changes

Checklist

• PR description included
• yarn test passes
• Tests are updated
• Relevant documentation is changed or added (and PR referenced)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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