fix(hmr): don't consider CSS dep as a circular dep

[sapphi-red]

Description

In future, maybe we should add cssImporters field to ModuleNode type which will resolve these tailwind related issues together including #9512. But that will be a big change, so instead I made a small change that would fix the case that was working in past.

fixes #15221
refs #14867
refs 6eaec3a

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines, especially the Pull Request Guidelines.
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• Update the corresponding documentation if needed.
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[ArnaudBarre]

The real long term solutions is Tailwind moving out of PostCSS and integrating with bundlers like unoccs does, so I'm fine with this change

[bluwy]

Thanks for handling this