the error need to be retryed for br import

[Leavrth]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. br restore

2. What did you expect to see? (Required)

success

3. What did you see instead (Required)

report the error:

Error obtaining chunk: error reading a body from connection: end of file before message length reached: ....

4. What is your TiDB version? (Required)

v6.5.5