tidb version v6.5.0 tikv node cdc memory increasing evoke oom
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Description
## Bug Report
### 1. Minimal reproduce step (Required)
tidb v5.2.1 cluster plus ticdc sync to kafka cluster ，update to v6.5.0
### 2. What did you expect to see? (Required)
The memory usage of tikv-server is kept at a reasonable size to avoid out-of-memory errors (OOM)
### 3. What did you see instead (Required)
tikv-server's memory usage in CDC module keeps increasing until the tikv process runs out of memory.
### 4. What is your TiDB version? (Required)
v6.5.0
| Release Version: v6.5.0
Edition: Community
Git Commit Hash: 706c3fa3c526cdba5b3e9f066b1a568fb96c56e3
Git Branch: heads/refs/tags/v6.5.0
UTC Build Time: 2022-12-27 03:50:44
GoVersion: go1.19.3
Race Enabled: false
TiKV Min Version: 6.2.0-alpha
Check Table Before Drop: false
Store: tikv
forum issue
https://asktug.com/t/topic/1005801
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