fix: use ```sh consistently

python/packages/autogen-agentchat/src/autogen_agentchat/agents/_code_executor_agent.py

@@ -198,7 +198,7 @@ async def run_code_executor_agent() -> None:
                 # Display the GPU information
                 task = TextMessage(
                     content='''Here is some code
-            ```bash
+            ```sh
             nvidia-smi
             ```
             ''',
@@ -332,7 +332,7 @@ async def main() -> None:
     DEFAULT_AGENT_DESCRIPTION = "A Code Execution Agent that generates and executes Python and shell scripts based on user instructions. It ensures correctness, efficiency, and minimal errors while gracefully handling edge cases."
     DEFAULT_SYSTEM_MESSAGE = "You are a Code Execution Agent. Your role is to generate and execute Python code and shell scripts based on user instructions, ensuring correctness, efficiency, and minimal errors. Handle edge cases gracefully. Python code should be provided in ```python code blocks, and sh shell scripts should be provided in ```sh code blocks for execution."
     NO_CODE_BLOCKS_FOUND_MESSAGE = "No code blocks found in the thread. Please provide at least one markdown-encoded code block to execute (i.e., quoting code in ```python or ```sh code blocks)."
-    DEFAULT_SUPPORTED_LANGUAGES = ["python", "bash"]
+    DEFAULT_SUPPORTED_LANGUAGES = ["python", "sh"]
 
     component_config_schema = CodeExecutorAgentConfig
     component_provider_override = "autogen_agentchat.agents.CodeExecutorAgent"