dm: upgrade TiDB dependencies for import-into table reuse

[GMHDBJD]

What problem does this PR solve?

Issue Number: ref pingcap/tidb#71496

DM import-into uses TiDB Lightning through github.com/pingcap/tidb. The Lightning fix for reusing an existing downstream table after a CREATE TABLE execution error has been merged in TiDB, but the current TiFlow dependency still points to an older TiDB revision and does not contain the fix.

What is changed and how it works?

Upgrade the TiDB module and its parser submodule to the TiDB revision containing the Lightning fix:

• github.com/pingcap/tidb → v1.1.0-beta.0.20260923092734-13103a00793a
• github.com/pingcap/tidb/pkg/parser → v0.0.0-20260923082834-1869807c5fdb

The dependency update also brings the compatible client-go and tipb revisions required by the new TiDB module. No DM business logic changes are needed; import-into will use the fixed Lightning implementation after rebuilding DM.

Check List

Tests

• Unit tests: go test ./dm/loader ./dm/checker ./dm/pkg/cancelcause

Questions

Will it cause performance regression or break compatibility?

No. This only updates the TiDB/Lightning dependency used by DM.

Do you need to update user documentation, design documentation or monitoring documentation?

No.

Release note

None

Summary by CodeRabbit

• Chores
  • Updated internal component versions to incorporate dependency maintenance changes.
  • No user-facing features or behavior changes were introduced.

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[GMHDBJD]

Superseded by existing dependency refresh PR #12863, which has been updated to include the TiDB Lightning fix from pingcap/tidb#71497.