fix httpx.client unexpected auto closed by the genai.client (#2007)

models/gemini/manifest.yaml

@@ -34,4 +34,4 @@ resource:
     tool:
       enabled: true
 type: plugin
-version: 0.5.10
+version: 0.5.11

models/gemini/models/llm/llm.py

@@ -605,6 +605,7 @@ class GoogleLargeLanguageModel(LargeLanguageModel):
         credentials: dict,
         response: Iterator[types.GenerateContentResponse],
         prompt_messages: list[PromptMessage],
+        genai_client: genai.Client,
     ) -> Generator[LLMResultChunk]:
         """
         Handle llm stream response
@@ -627,8 +628,13 @@ class GoogleLargeLanguageModel(LargeLanguageModel):
         :param credentials: credentials
         :param response: response
         :param prompt_messages: prompt messages
+        :param genai_client: genai client to keep alive during streaming
         :return: llm response chunk generator result
         """
+        # Keep a reference to the client to prevent it from being garbage collected
+        # while the generator is still active
+        _client_ref = genai_client
+        
         index = -1
         self.is_thinking = False
 
@@ -893,7 +899,7 @@ class GoogleLargeLanguageModel(LargeLanguageModel):
                 model=model, contents=contents, config=config
             )
             return self._handle_generate_stream_response(
-                model, credentials, response, prompt_messages
+                model, credentials, response, prompt_messages, genai_client
             )
 
         response = genai_client.models.generate_content(