Removes duplicated call from langchain/client/langchain.py (#5449)
This removes duplicate code presumably introduced by a cut-and-paste
error, spotted while reviewing the code in
```langchain/client/langchain.py```. The original code had back to back
occurrences of the following code block:
```
response = self._get(
path,
params=params,
)
raise_for_status_with_text(response)
```