Unstable test http_api_tls

[hongyunyan]

What did you do?

test pass

What did you expect to see?

failed

What did you see instead?

Link https://github.com/pingcap/ticdc/actions/runs/12899772346/job/35969100407?pr=939

Versions of the cluster

Upstream TiDB cluster version (execute SELECT tidb_version(); in a MySQL client):

(paste TiDB cluster version here)

Upstream TiKV version (execute tikv-server --version):

(paste TiKV version here)

TiCDC version (execute cdc version):

(paste TiCDC version here)