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add release notes for v7.4.0#14954

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ti-chi-bot[bot] merged 170 commits intopingcap:masterpingcap/docs-cn:masterfrom hfxsd:v7.4-release-noteshfxsd/docs-cn:v7.4-release-notesCopy head branch name to clipboardOct 12, 2023

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• compatible with the default collation utf8mb4_0900_ai_ci of MySQL 8.0 utf8mb4 charset

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• Merge branch 'v7.4-release-notes' of https://github.com/hfxsd/docs-cn into pr/14954

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