[integration][openai] Update stale default model gpt-3.5-turbo to gpt-4o-mini (#906)

Author: weiqingy

docs/content/docs/development/chat_models.md

@@ -845,7 +845,7 @@ OpenAI provides cloud-based chat models with state-of-the-art performance for a
 | Parameter | Type | Default | Description |
 |-----------|------|---------|-------------|
 | `connection` | str | Required | Reference to connection method name |
-| `model` | str | `"gpt-3.5-turbo"` | Name of the chat model to use |
+| `model` | str | `"gpt-4o-mini"` | Name of the chat model to use |
 | `prompt` | Prompt \| str | None | Prompt template or reference to prompt resource |
 | `tools` | List[str] | None | List of tool names available to the model |
 | `temperature` | float | `0.1` | Sampling temperature (0.0 to 2.0) |
@@ -863,7 +863,7 @@ OpenAI provides cloud-based chat models with state-of-the-art performance for a
 | Parameter | Type | Default | Description |
 |-----------|------|---------|-------------|
 | `connection` | String | Required | Reference to connection method name |
-| `model` | String | `"gpt-3.5-turbo"` | Name of the chat model to use |
+| `model` | String | `"gpt-4o-mini"` | Name of the chat model to use |
 | `prompt` | Prompt \| String | None | Prompt template or reference to prompt resource |
 | `tools` | List<String> | None | List of tool names available to the model |
 | `temperature` | double | `0.1` | Sampling temperature (0.0 to 2.0) |

integrations/chat-models/openai/src/main/java/org/apache/flink/agents/integrations/chatmodels/openai/OpenAICompletionsSetup.java

@@ -58,7 +58,7 @@
  */
 public class OpenAICompletionsSetup extends BaseChatModelSetup {
 
-    private static final String DEFAULT_MODEL = "gpt-3.5-turbo";
+    private static final String DEFAULT_MODEL = "gpt-4o-mini";
     private static final double DEFAULT_TEMPERATURE = 0.1d;
     private static final int DEFAULT_TOP_LOGPROBS = 0;
     private static final boolean DEFAULT_STRICT = false;

python/flink_agents/integrations/chat_models/openai/openai_chat_model.py

@@ -35,7 +35,7 @@
     resolve_openai_credentials,
 )
 
-DEFAULT_OPENAI_MODEL = "gpt-3.5-turbo"
+DEFAULT_OPENAI_MODEL = "gpt-4o-mini"
 
 
 class OpenAIChatModelConnection(BaseChatModelConnection):