en,zh: add v1.6.5 release notes; bump TiDB & TiDB Operator #8239

Job	Run time
check-unclosed-tags	14s
check-file-encoding	13s
check-control-characters	13s
markdownlint	27s
check-manual-line-breaks	8s
verify-internal-link-anchors	23s
verify-internal-links	1m 35s
check-git-conflicts	11s
	3m 24s

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