ticdc: correct the tiup cluster command

[wk989898]

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• [x] master (the latest development version)
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• [ ] v8.4 (TiDB 8.4 versions)
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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-08-14 09:49:39.65263487 +0000 UTC m=+520178.687218098: :ballot_box_with_check: agreed by qiancai.

[ti-chi-bot[bot]]

@qiancai: Your lgtm message is repeated, so it is ignored.

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[qiancai]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #21608.