Release 8.5 20260608 v8.5.6

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Release 8.5 20260608 v8.5.6

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[ti-chi-bot]

Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

📝 Please follow instructions in the contributing guide to update your commits with the DCO

Full details of the Developer Certificate of Origin can be found at developercertificate.org.

The list of commits missing DCO signoff:

• 0f6fa25 sync etcd endpoints immediately after initializing the client (sync etcd endpoints immediately after initializing the client #1573)
• 4a4daf2 tikv: close region cache before PD client (tikv: close region cache before PD client #1853)

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