[bug][tidb-connector]checkpoint is not updated long after a task has been running

[wangxiaojing]

Describe the bug(Please use English)
A clear and concise description of what the bug is.

Environment :

• Flink version : 1.14
• Flink CDC version: 2.3
• Database and version: 5.1

To Reproduce
Steps to reproduce the behavior:

1. The error :
   ``2022-10-27 12:48:34,981 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953707961122840, regionId: 1721083
   2022-10-27 12:48:35,469 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953708092194817, regionId: 10236245
   2022-10-27 12:48:35,469 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953708092194817, regionId: 10237829
   2022-10-27 12:48:35,469 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953708092194817, regionId: 8419115
   2022-10-27 12:48:35,477 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953708092194820, regionId: 7318373
   2022-10-27 12:48:35,477 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953708092194820, regionId: 11085331
   2022-10-27 12:48:35,631 INFO com.ververica.cdc.connectors.tidb.TiKVRichParallelSourceFunction [] - snapshotState checkpoint: 9 at resolvedTs: 436952756312866827`

2022-10-27 12:58:35,594 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953865404809241, regionId: 8684959 2022-10-27 12:58:35,594 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953865404809241, regionId: 8309437 2022-10-27 12:58:35,594 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953865404809241, regionId: 1721083 2022-10-27 12:58:35,594 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436953865404809241, regionId: 11090547 2022-10-27 12:58:35,635 INFO com.ververica.cdc.connectors.tidb.TiKVRichParallelSourceFunction [] - snapshotState checkpoint: 10 at resolvedTs: 436952756312866827
`

2022-10-27 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 8424191 2022-10-27 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 8343109 2022-10-27 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 3287795 2022-10-27 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 8221803 2022-10-27 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 11120919 2022-10-27 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 10296761 2022-10-2 7 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 8309437 2022-10-27 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 8684959 2022-10-27 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 11090547 2022-10-27 13:08:35,197 INFO org.tikv.cdc.CDCClient [] - handle resolvedTs: 436954022586351623, regionId: 1721083 2022-10-27 13:08:35,632 INFO com.ververica.cdc.connectors.tidb.TiKVRichParallelSourceFunction [] - snapshotState checkpoint: 11 at resolvedTs: 436952756312866827

Additional Description
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[wangxiaojing]

#1686

[PatrickRen]

Closing this issue because it was created before version 2.3.0 (2022-11-10). Please try the latest version of Flink CDC to see if the issue has been resolved. If the issue is still valid, kindly report it on Apache Jira under project Flink with component tag Flink CDC. Thank you!