*: update client-go to latest tidb-6.1 branch

[sticnarf]

Signed-off-by: Yilin Chen sticnarf@gmail.com

What problem does this PR solve?

Issue Number: ref #40461

What is changed and how it works?

Update client-go to include tikv/client-go#664 and tikv/client-go#678.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

Clear stale region cache periodically to avoid memory leak and performance degradation

[ti-chi-bot]

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[cfzjywxk]

Included in #42290.