add api key to ollama client to support open webui

Author: MorpheusI0

metagpt/provider/ollama_api.py

@@ -193,7 +193,7 @@ class OllamaLLM(BaseLLM):
     """
 
     def __init__(self, config: LLMConfig):
-        self.client = GeneralAPIRequestor(base_url=config.base_url)
+        self.client = GeneralAPIRequestor(base_url=config.base_url, key=config.api_key)
         self.config = config
         self.http_method = "post"
         self.use_system_prompt = False