cohere[patch]: Fix positional argument (#19678)

cohere: Fix positional argument

Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>

libs/partners/cohere/langchain_cohere/chat_models.py

@@ -303,7 +303,7 @@ class ChatCohere(BaseChatModel, BaseCohere):
 
     def get_num_tokens(self, text: str) -> int:
         """Calculate number of tokens."""
-        return len(self.client.tokenize(text).tokens)
+        return len(self.client.tokenize(text=text).tokens)
 
 
 def _format_cohere_tool_calls(