[Bug Report]缩进 4 个空格的代码段没有正常按对应的语法渲染-plantuml

[recrute]

Prerequisites

• [ ] There isn't an existing issue that reports the same bug to avoid duplicates.
• [ ] The provided information offers a minimal reproducible example of the bug.
• [ ] For Q&A, please open a GitHub Discussion instead.

Describe the Bug

1234

```plantuml
@startuml
participant A
participant B

autonumber

@enduml
```

Reproduction Steps

No response

System Information

No response

Contributing

None