update the release info of TiDB Cloud (#7986)#8047

ti-chi-bot merged 3 commits intopingcap:release-5.4pingcap/docs:release-5.4from

ti-chi-bot:cherry-pick-7986-to-release-5.4ti-chi-bot/docs:cherry-pick-7986-to-release-5.4Copy head branch name to clipboard