Most notably in this update, Twenty Twenty-Three becomes the second default theme to have the “Accessibility Ready” tag.
For a full list of changes being included, see the `twentytwentythree` repository on GitHub: ca662828b7...4ea5d832ec.
Follow up to [54235], [54236], [54312], [54372].
Props mikachan, madhudollu, tahmidulkarim, joen, poena, scruffian, beafialho, colorful-tones, audrasjb, critterverse, luminuu, wildworks, hiyascout, desrosj.
Fixes#56383.
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