v12 (misskey-dev#5712)

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* Use dart-sass (misskey-dev#5738)

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* Update CHANGELOG.md

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* Allow 'internal' device in WebAuthN (misskey-dev#5757)

misskey-dev#5756 のv12版

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Co-authored-by: MeiMei <[email protected]>
Co-authored-by: Satsuki Yanagi <[email protected]>