主键更新为原值报错：Sorry, update pk value is not supported!

- [ ] I have searched the [issues](https://github.com/seata/seata/issues) of this repository and believe that this is not a duplicate.

### Ⅰ. Issue Description
tkmabatis 使用 updateByPrimaryKeySelective() 会根据主键更新非空字段，update table set id=id，set xx=xx where id =?, 主键修改为原值报错：Sorry, update pk value is not supported!

### Ⅱ. Describe what happened
从1.2 更新到 1.4 的时候报错

If there is an exception, please attach the exception trace:

Just paste your stack trace here!
```

### Ⅲ. Describe what you expected to happen

### Ⅳ. How to reproduce it (as minimally and precisely as possible)

1. xxx
2. xxx
3. xxx

### Ⅴ. Anything else we need to know?

### Ⅵ. Environment:

- JDK version :
- OS :
- Others:

Start by reproducing the tk.mybatis updateByPrimaryKeySelective() case described in the issue, comparing Seata 1.2 and 1.4. Trace the generated update table set id=id statement and the source of "Sorry, update pk value is not supported!"; done means updating a primary key to its existing value no longer fails, with a regression test.

Written by the indexing model from the issue text.