*: update the dependency of TiDB

[rleungx]

What problem does this PR solve?

Related to #609. This PR needs pingcap/tidb#21247 to be merged first.

What is changed and how it works?

Update the dependency of tidb

Check List

Tests

• Manual test

Release Note

• No release note

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[kennytm]

can you collaborate with @JmPotato (#616) on this? it's better avoid having multiple PRs modifying the same go.mod.

[rleungx]

@kennytm I am going to close this PR and @JmPotato will update the dependency once pingcap/tidb#21247 is merged.