tests(ticdc): fix bank test (#11407)

[ti-chi-bot]

This is an automated cherry-pick of #11407

What problem does this PR solve?

Issue Number: close #11806

What is changed and how it works?

Check List

Tests

• Integration test
• Manual test (add detailed scripts or steps below)
  

Questions

Will it cause performance regression or break compatibility?

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

Release note

Please refer to [Release Notes Language Style Guide](https://pingcap.github.io/tidb-dev-guide/contribute-to-tidb/release-notes-style-guide.html) to write a quality release note.

If you don't think this PR needs a release note then fill it with `None`.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign suzaku for approval. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
jenkins-ticdc/verify	710fd35	link	true	/test verify
pull-cdc-integration-storage-test	710fd35	link	true	/test cdc-integration-storage-test
pull-cdc-integration-mysql-test	710fd35	link	true	/test cdc-integration-mysql-test
pull-cdc-integration-kafka-test	710fd35	link	true	/test cdc-integration-kafka-test

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.