cohere[patch]: support request timeout in BaseCohere (langchain-ai#19641

)

As in langchain-ai#19346, this PR exposes `request_timeout` in `BaseCohere`, while
`max_retires` is no longer a parameter of the beneath client
(`cohere.Client`) and it is already configured in
`langchain_cohere.llms.Cohere`.

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/partners/cohere/langchain_cohere/llms.py

@@ -66,6 +66,9 @@ class BaseCohere(Serializable):
     streaming: bool = Field(default=False)
     """Whether to stream the results."""
 
+    timeout: Optional[float] = 60
+    """Timeout in seconds for the Cohere API request."""
+
     user_agent: str = "langchain"
     """Identifier for the application making the request."""
 
@@ -82,11 +85,13 @@ def validate_environment(cls, values: Dict) -> Dict:
         values["client"] = cohere.Client(
             api_key=values["cohere_api_key"].get_secret_value(),
             client_name=client_name,
+            timeout=values["timeout"],
             base_url=values["base_url"],
         )
         values["async_client"] = cohere.AsyncClient(
             api_key=values["cohere_api_key"].get_secret_value(),
             client_name=client_name,
+            timeout=values["timeout"],
             base_url=values["base_url"],
         )
         return values