release: add v6.1.7 release notes (#14404)#14480

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ti-chi-bot[bot] merged 2 commits intopingcap:release-6.1from ti-chi-bot:cherry-pick-14404-to-release-6.1

Jul 12, 2023

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Commits on Jul 12, 2023

This is an automated cherry-pick of pingcap#14404

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