community[patch]: GigaChat model selection fix (#20988)
Fixed the error that the model name is never actually put into GigaChat
request payload, always defaulting to `GigaChat-Lite`.
With this fix, model selection through
```python
import os
from langchain.chat_models.gigachat import GigaChat
chat = GigaChat(
name="GigaChat-Pro", # <- HERE!!!!!
...
)
```
should actually work, as intended in
[here](https://github.com/langchain-ai/langchain/blob/804390ba4bcc306b90cb6d75b7f01a4231ab6463/libs/community/langchain_community/llms/gigachat.py#L36).
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Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
