robot does not work when miss the linked issue.

[3AceShowHand]

Bug Report

• I have searched the issues of this repository and believe that this is not a duplicate.

Related link

• Which project:

TiCDC

• PR or Issue Link:

https://github.com/pingcap/tiflow/pulls?q=is%3Apr+base%3Arelease-6.1-20220719+is%3Aclosed

Steps to reproduce(Optional)

What is expected?

What is actually happening?

[ti-chi-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close.
Send feedback to sig-community-infra or Mini256.
/lifecycle stale

[ti-chi-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close.
Send feedback to sig-community-infra or Mini256.
/lifecycle rotten