patch: remove usage of llm, chat model __call__ (#20788)

- `llm(prompt)` -> `llm.invoke(prompt)`
- `llm(prompt=prompt` -> `llm.invoke(prompt)` (same with `messages=`)
- `llm(prompt, callbacks=callbacks)` -> `llm.invoke(prompt,
config={"callbacks": callbacks})`
- `llm(prompt, **kwargs)` -> `llm.invoke(prompt, **kwargs)`

libs/partners/anthropic/langchain_anthropic/llms.py

@@ -232,7 +232,7 @@ class AnthropicLLM(LLM, _AnthropicCommon):
 
                 prompt = "What are the biggest risks facing humanity?"
                 prompt = f"\n\nHuman: {prompt}\n\nAssistant:"
-                response = model(prompt)
+                response = model.invoke(prompt)
 
         """
         if self.streaming: