fix(plugin-sass): unpin sass-embedded and update to v1.89.2

[chenjiahan]

Summary

Unpin sass-embedded and update to the latest v1.89.2 to fix the Package subpath './codegenv2' is not defined by "exports" in //node_modules/.pnpm/sass-embedded@1.89.1/node_modules/@bufbuild/protobuf/package.json error.

Related Links

#5360

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR unpins the version of sass-embedded in the plugin-sass package to allow for updates past version 1.89.1, addressing the subpath error in the dependency.

• Unpins sass-embedded by changing its version specifier from "1.89.1" to "^1.89.2"
• Ensures the latest patch release (v1.89.2) is used to resolve the noted error

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported