fix(agent): fix wrong module import in ReAct agent (#262)

In module `llama_stack_client/lib/agents/react/agent.py`, the `Headers`
class is imported with the wrong path.

Fixes: #261

Signed-off-by: Cesar Berrospi Ramis <[email protected]>

Author: ceberam

src/llama_stack_client/lib/agents/react/agent.py

@@ -13,7 +13,7 @@
 from llama_stack_client.types.shared_params.response_format import ResponseFormat
 from llama_stack_client.types.shared_params.sampling_params import SamplingParams
 
-from ..._types import Headers
+from ...._types import Headers
 from ..agent import Agent, AgentUtils
 from ..client_tool import ClientTool
 from ..tool_parser import ToolParser