*: update tidb

[sticnarf]

What problem does this PR solve?

Lock resolving in TiDB has a bug: pingcap/tidb#24384.

What is changed and how it works?

Update TiDB to the latest version with the bug fixed.

Check List

Tests

• No code

Related changes

• Need to cherry-pick to the release branch

Release Note

• No release note

[kennytm]

Please update the (*mockChecksumKVClient) Send function in pkg/lightning/restore/checksum_test.go.

[2021-04-30T09:15:40.673Z] pkg/lightning/restore/checksum_test.go:178:76: cannot use kvClient (type *mockChecksumKVClient) as type "github.com/pingcap/tidb/kv".Client in field value:

[2021-04-30T09:15:40.673Z] 	*mockChecksumKVClient does not implement "github.com/pingcap/tidb/kv".Client (wrong type for Send method)

[2021-04-30T09:15:40.673Z] 		have Send(context.Context, *"github.com/pingcap/tidb/kv".Request, *"github.com/pingcap/tidb/store/tikv/kv".Variables, *memory.Tracker, bool) "github.com/pingcap/tidb/kv".Response

[2021-04-30T09:15:40.673Z] 		want Send(context.Context, *"github.com/pingcap/tidb/kv".Request, interface {}, *memory.Tracker, bool) "github.com/pingcap/tidb/kv".Response

[sticnarf]

/run-integration-tests

[sticnarf]

/run-all-tests

[sticnarf]

@kennytm @overvenus PTAL, thanks!

[kennytm]

/lgtm

[ti-chi-bot]

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[ti-chi-bot]

@sticnarf: PR needs rebase.

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[sticnarf]

Superseded by #1103